Download 8e_START_HERE_CH11_LECTURE

Chapter
11
The Muscular
System
PowerPoint® Lecture Slides
prepared by Jason LaPres
Lone Star College - North Harris
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Copyright © 2009 Pearson Education, Inc.,
publishing as Pearson Benjamin Cummings
An Introduction to the Muscular System
 The Muscular System
 Consists only of skeletal muscles
 Muscle Organization and Function
 Muscle organization affects power, range, and speed
of muscle movement
 Fascicles
 Muscle cells (fibers) are organized in bundles (fascicles)
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Fascicle Arrangement
 Classification of Skeletal Muscles
 By the way fascicles are organized
 By relationships of fascicles to tendons
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Fascicle Arrangement
 Organization of Skeletal Muscle Fibers
 Four patterns of fascicle organization
 Parallel
 Convergent
 Pennate
 Circular
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Fascicle Arrangement
 Parallel Muscles
 Fibers parallel to the long axis of muscle
 For example, biceps brachii
 Depends on total number of myofibrils
 Directly relates to cross section of muscle
 1 in.2 (6.45 cm2) of cross section develops 50 lb (23
kg) of tension
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Fascicle Arrangement
[INSERT FIG. 11.1a]
Figure 11–1a Muscle Types Based on Pattern of Fascicle Organization.
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Fascicle Arrangement
 Convergent Muscles
 A broad area converges on attachment site
(tendon, aponeurosis, or raphe)
 Muscle fibers pull in different directions,
depending on stimulation
 For example, pectoralis muscles
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Fascicle Arrangement
[INSERT FIG. 11.1b]
Figure 11–1b Muscle Types Based on Pattern of Fascicle Organization.
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Fascicle Arrangement
 Pennate Muscles
 Form an angle with the tendon
 Do not move as far as parallel muscles
 Contain more myofibrils than parallel muscles
 Develop more tension than parallel muscles
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Fascicle Arrangement
 Pennate Muscles
 Unipennate
 Fibers on one side of tendon
 For example, extensor digitorum
 Bipennate
 Fibers on both sides of tendon
 For example, rectus femoris
 Multipennate
 Tendon branches within muscle
 For example, deltoid
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Fascicle Arrangement
[INSERT FIG. 11.1c, d, e]
Figure 11–1c, d, e Muscle Types Based on Pattern of Fascicle
Organization.
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Fascicle Arrangement
 Circular Muscles
 Also called sphincters
 Open and close to guard entrances of body
 For example, orbicularis oris muscle of the
mouth
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Fascicle Arrangement
Figure 11–1f Muscle Types Based on Pattern of Fascicle Organization.
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Levers
 Skeletal Motion
 Skeletal muscles attach to skeleton, produce
motion
 Type of muscle attachment affects power,
range, and speed of muscle movement
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Levers
 Levers
 Mechanically, each bone is a lever (a rigid,
moving structure)
 And each joint a fulcrum (a fixed point)
 Muscles provide applied force (AF)
 Required to overcome resistance (R)
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Levers
 Function of a lever is to change
 Direction of an AF
 Distance and speed of movement produced by an AF
 Effective strength of an AF
 The Three Classes of Levers
 Depend on the relationship between applied force,
fulcrum, and resistance
 First class, second class, and third class
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Levers
 First-Class Lever
 Seesaw or teeter-totter is an example
 Center fulcrum between applied force and
resistance
 Force and resistance are balanced
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Levers
[INSERT FIG. 11.2a]
Figure 11–2a The Three Classes of Levers.
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Levers
 Second-Class Levers
 Wheelbarrow is an example
 Center resistance between applied force and
fulcrum
 A small force moves a large weight
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Levers
[INSERT FIG. 11.2b]
Figure 11–2b The Three Classes of Levers.
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Levers
 Third-Class Levers
 Most common levers in the body
 Center applied force between resistance and fulcrum
 Greater force moves smaller resistance
 Maximizes speed and distance traveled
First, Second, and Third-Class Levers
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Levers
[INSERT FIG. 11.2c]
Figure 11–2c The Three Classes of Levers.
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Muscle Attachments to Other Tissues
 Origins and Insertions
 Muscles have one fixed point of attachment
(origin) and one moving point of attachment
(insertion)
 Most muscles originate or insert on the
skeleton
 Origin is usually proximal to insertion
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Muscle Attachments to Other Tissues
 Actions
 Movements produced by muscle contraction
 Body movements
 For example, flexion, extension, adduction, etc.
 Described in terms of bone, joint, or region
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Muscle Attachments to Other Tissues
 Muscle Interactions
 Muscles work in groups to maximize
efficiency
 Smaller muscles reach maximum tension first,
followed by larger, primary muscles
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Muscle Attachments to Other Tissues
 Muscle Terminology Based on Function
 Agonist (or prime mover)
 Produces a particular movement
 Antagonist
 Opposes movement of a particular agonist
 Synergist
 A smaller muscle that assists a larger agonist
 Helps start motion or stabilize origin of agonist (fixator)
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Muscle Attachments to Other Tissues
 Muscle Opposition
 Agonists and antagonists work in pairs:
 When one contracts, the other stretches
 Such as flexors–extensors, abductors–adductors,
etc.
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Naming Skeletal Muscles
 Names of Skeletal Muscles
 Correct names of muscles include the term
muscle
 Exceptions
 Platysma
 Diaphragm
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Naming Skeletal Muscles
 Descriptive Names for Skeletal Muscles
 Location in the body
 Origin and insertion
 Fascicle organization
 Relative position
 Structural characteristics
 Action
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Naming Skeletal Muscles
 Location in the Body
 Identifies body regions
 For example, temporalis muscle
 Origin and Insertion
 First part of name indicates origin
 Second part of name indicates insertion
 For example, genioglossus muscle
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Naming Skeletal Muscles
 Fascicle Organization
 Describes fascicle orientation within muscle
 i.e., rectus (straight), transversus, oblique
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Naming Skeletal Muscles
 Relative Position
 Externus (superficialis)
 Visible at body surface
 Internus (profundus)
 Deep muscles
 Extrinsic
 Muscles outside an organ
 Intrinsic
 Muscles inside an organ
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Naming Skeletal Muscles
 Structural Characteristics
 Number of tendons
 bi = 2, tri = 3
 Shape
 Trapezius, deltoid, rhomboid
 Size
 Many terms refer to muscle size
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Naming Skeletal Muscles
 Descriptive Terms for Muscle Size
 Longus = long
 Longissimus = longest
 Teres = long and round
 Brevis = short
 Magnus = large
 Major = larger
 Maximus = largest
 Minor = small
 Minimus = smallest
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Naming Skeletal Muscles
 Action
 Movements
 For example, flexor, extensor, retractor
 Occupations or habits
 For example, risor = laughter
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Naming Skeletal Muscles
[INSERT Table. 11.1-please use 2 slides if
necessary]
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Naming Skeletal Muscles
[INSERT Table. 11.1-please use 2 slides if
necessary]
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Muscular System Overview
 Divisions of the Muscular System
 Axial muscles
 Position head and spinal column
 Move rib cage
 60% of skeletal muscles
 Appendicular muscles
 Support pectoral and pelvic girdles
 Support limbs
 40% of skeletal muscles
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Muscular System Overview
Figure 11–3a An Overview of the Major Skeletal Muscles.
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Muscular System Overview
Figure 11–3a An Overview of the Major Skeletal Muscles.
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Muscular System Overview
Figure 11–3b An Overview of the Major Skeletal Muscles.
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Muscular System Overview
Figure 11–3b An Overview of the Major Skeletal Muscles.
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Axial Musculature
 The Axial Muscles
 Divisions based on location and function
 Muscles of head and neck
 Muscles of vertebral column
 Oblique and rectus muscles
 Muscles of pelvic floor
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Axial Musculature
 Six Muscle Groups of the Head and Neck
 Muscles of facial expression
 Originate on skull
 Extrinsic eye muscles
 Originate on surface of orbit
 Control position of eye
 Muscles of mastication
 Move the mandible
 Muscles of the tongue
 Names end in glossus
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Axial Musculature
 Six Muscle Groups of the Head and Neck
 Muscles of the pharynx
 Begin swallowing process
 Anterior muscles of the neck
 Control position of larynx
 Depress the mandible
 Support tongue and pharynx
3D Peel-Away of Muscles of the Head and Neck
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Axial Musculature
 Muscles of Facial Expression
 Orbicularis oris: constricts the mouth opening
 Buccinator: moves food around the cheeks
 Muscles of the epicranium (scalp)
Buccinator
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Axial Musculature
 Muscles of Facial Expression
 Muscles of the epicranium (scalp)
 Temporoparietalis
 Occipitofrontalis
– Frontal and occipital bellies
– Separated by epicranial aponeurosis
 Platysma
– Covers anterior surface of neck
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Axial Musculature
Figure 11–4a Muscles of Facial Expression.
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Axial Musculature
Figure 11–4b Muscles of Facial Expression.
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Axial Musculature
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Axial Musculature
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Axial Musculature
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slides if necessary]
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Axial Musculature
 Six Extrinsic Eye Muscles (Extra ocular)
 Inferior rectus
 Medial rectus
 Superior rectus
 Lateral rectus
 Inferior oblique
 Superior oblique
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Axial Musculature
Figure 11–5a,b Extrinsic Eye Muscles.
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Axial Musculature
Figure 11–5c, d Extrinsic Eye Muscles.
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Axial Musculature
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Axial Musculature
 Muscles of Mastication
 Masseter
 The strongest jaw muscle
 Temporalis
 Helps lift the mandible
 Pterygoid muscles
 Positions mandible for chewing
Masseter
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Temporalis
Axial Musculature
Figure 11–6a Muscles of Mastication.
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Axial Musculature
[INSERT FIG. 11.6b]
Figure 11–6b Muscles of Mastication.
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Axial Musculature
[INSERT Table. 11.4]
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Axial Musculature
 Muscles of the Tongue
 Palatoglossus
 Originates at palate
 Styloglossus
 Originates at styloid process
 Genioglossus
 Originates at chin
 Hypoglossus
 Originates at hyoid bone
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Axial Musculature
Figure 11–7 Muscles of the Tongue.
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Axial Musculature
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Axial Musculature
 Muscles of the Pharynx
 Pharyngeal constrictor muscles
 Move food into esophagus
 Laryngeal elevator muscles
 Elevate the larynx
 Palatal muscles
 Lift the soft palate
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Axial Musculature
Figure 11–8 Muscles of the Pharynx.
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Axial Musculature
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Axial Musculature
 Anterior Muscles of the Neck
 Digastric
 From chin to hyoid
 And hyoid to mastoid
 Mylohyoid
 Floor of the mouth
 Geniohyoid
 Between hyoid and chin
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Axial Musculature
 Anterior Muscles of the Neck
 Stylohyoid
 Between hyloid and styloid
 Sternocleidomastoid
 From clavicle and sternum to mastoid
 Omohyoid
 Attaches scapula, clavicle, first rib, and hyoid
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Axial Musculature
Figure 11–9a Muscles of the Anterior Neck.
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Axial Musculature
Figure 11–9b Muscles of the Anterior Neck.
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Axial Musculature
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Axial Musculature
 Muscles of the Vertebral Column
 Spinal extensors or erector spinae muscles
(superficial and deep)
 Spinal flexors (transversospinalis)
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Axial Musculature
 Muscles of the Vertebral Column
 Superficial Spinal Extensors
 Spinalis group
 Longissimus group
 Iliocostalis group
Longissimus
Spinalis
Iliocostalis
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Axial Musculature
 Muscles of the Vertebral Column
 Deep Spinal Extensors
 Semispinalis group
 Multifidus muscle
 Interspinalis muscles
 Intertransversarii muscles
 Rotatores muscles
SemispinalisCapitus
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Axial Musculature
[INSERT FIG. 11.10a]
Figure 11–10a Muscles of the Vertebral Column.
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Axial Musculature
[INSERT FIG. 11.10c]
Figure 11–10c Muscles of the Vertebral Column.
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Axial Musculature
[INSERT Table. 11.8 (top portion)]
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Axial Musculature
[INSERT Table. 11.8 (middle portion)]
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Axial Musculature
 Muscles of the Vertebral Column
 Spinal flexors
 Neck
– Longus capitis and longus colli
– Rotate and flex the neck
 Lumbar
– Quadratus lumborum muscles
– Flex spine and depress ribs
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Axial Musculature
[INSERT FIG. 11.10b]
Figure 11–10b Muscles of the Vertebral Column.
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Axial Musculature
[INSERT FIG. 11.10a]
Figure 11–10a Muscles of the Vertebral Column.
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Axial Musculature
[INSERT Table. 11.8 (bottom portion)]
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Axial Musculature
 Oblique and Rectus Muscles
 Lie within the body wall
 Oblique muscles
 Compress underlying structures
 Rotate vertebral column
 Rectus muscles
 Flex vertebral column
 Oppose erector spinae
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Axial Musculature
 Oblique Muscles
 Cervical region
 Scalene muscles
 Flex the neck
 Thoracic region
 Intercostal muscles (external and internal)
– Respiratory movements of ribs
 Transversus thoracis
– Cross inner surface of ribs
Internal Intercostals
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External Intercostals
Axial Musculature
 Oblique Muscles
 Abdominopelvic region (same pattern as
thoracic)
 External oblique muscles
 Internal oblique muscles
 Transversus abdominis
External Obliques
Transversus Abdominis
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Internal Obliques
Axial Musculature
 Rectus Muscles
 Rectus abdominis
 Between xiphoid process and pubic symphysis
 Divided longitudinally by linea alba
 Divided transversely by tendinous inscriptions
 Diaphragmatic muscle or diaphragm
 Divides thoracic and abdominal cavities
 Performs respiration
Rectus Abdominis
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Axial Musculature
[INSERT FIG. 11.11a]
Figure 11–11a Oblique and Rectus Muscles and the Diaphragm.
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Axial Musculature
[INSERT FIG. 11.11b]
Figure 11–11b Oblique and Rectus Muscles and the Diaphragm.
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Axial Musculature
[INSERT FIG. 11.11c]
Figure 11–11c Oblique and Rectus Muscles and the Diaphragm.
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Axial Musculature
[INSERT Table. 11.9-please split onto 2
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Axial Musculature
[INSERT Table. 11.9-please split onto 2
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Axial Musculature
 Muscles of the Pelvic Floor
 Functions of pelvic floor muscles
 Support organs of pelvic cavity
 Flex sacrum and coccyx
 Control movement of materials through urethra and anus
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Axial Musculature
 Muscles of the Pelvic Floor
 Perineum
 Muscular sheet forming the pelvic floor, divided
into
– Anterior urogenital triangle
– Posterior anal triangle
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Axial Musculature
 Perineum
 Urogenital diaphragm
 Deep muscular layer between pubic bones
– Supports the pelvic floor
– And muscles of the urethra
 Superficial muscles of the urogenital triangle
– Support external genitalia
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Axial Musculature
 Muscles of the Pelvic Floor
 Perineum
 Pelvic diaphragm
– Deep muscular layer extending to pubis
» Supports anal triangle
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Axial Musculature
[INSERT FIG. 11.12a]
Figure 11–12a Muscles of the Pelvic Floor.
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Axial Musculature
[INSERT FIG. 11.12b]
Figure 11–12b Muscles of the Pelvic Floor.
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Axial Musculature
[INSERT Table. 11.10-please split onto 2
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Axial Musculature
[INSERT Table. 11.10-please split onto 2
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Appendicular Musculature
 Position and stabilize pectoral and pelvic
girdles
 Move upper and lower limbs
 Divisions of Appendicular Muscles
 Muscles of the shoulders and upper limbs
 Muscles of the pelvis and lower limbs
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Appendicular Musculature
[INSERT FIG. 11.13a]
Figure 11–13a An Overview of the Appendicular Muscles of the Trunk.
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Appendicular Musculature
[INSERT FIG. 11.13b]
Figure 11–13b An Overview of the Appendicular Muscles of the Trunk.
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Appendicular Musculature
 Muscles of the Shoulders and Upper
Limbs
 Position the pectoral girdle
 Move the arm
 Move the forearm and hand
 Move the hand and fingers
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Appendicular Musculature
 Muscles That Position the Pectoral Girdle
 Trapezius
 Superficial
 Covers back and neck to base of skull
 Inserts on clavicles and scapular spines
Trapezius
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Appendicular Musculature
 Muscles That Position the Pectoral Girdle
 Rhomboid and levator scapulae
 Deep to trapezius
 Attach to cervical and thoracic vertebrae
 Insert on scapular border
Rhomboid Minor
Rhomboid Major
Levator Scapulae
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Appendicular Musculature
[INSERT FIG. 11.15a]
Figure 11–14a Muscles That Position the Pectoral Girdle.
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Appendicular Musculature
 Muscles That Position the Pectoral Girdle
 Serratus anterior
 On the chest
 Originates along ribs
 Inserts on anterior scapular margin
Serratus Anterior
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Appendicular Musculature
 Muscles That Position the Pectoral Girdle
 Subclavius
 Originates on ribs
 Inserts on clavicle
 Pectoralis minor
 Attaches to scapula
Pectoralis Minor
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Appendicular Musculature
[INSERT FIG. 11.15b]
Figure 11–14b Muscles That Position the Pectoral Girdle.
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Appendicular Musculature
[INSERT Table. 11.11]
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Appendicular Musculature
 Muscles That Move the Arm
 Deltoid
 The major abductor
 Supraspinatus
 Assists deltoid
Supraspinatus
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Appendicular Musculature
 Muscles That Move the Arm
 Subscapularis and Teres major
 Produce medial rotation at shoulder
Subscapularis
Teres Major
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Appendicular Musculature
Figure 11–15a Muscles That Move the Arm.
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Appendicular Musculature
 Muscles That Move the Arm
 Infraspinatus and teres minor
 Produce lateral rotation at shoulder
 Coracobrachialis
 Attaches to scapula
 Produces flexion and adduction at shoulder
Infraspinatus
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Appendicular Musculature
Figure 11–15b(Part 1 of 2) Muscles That Move the Arm.
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Appendicular Musculature
 Muscles That Move the Arm
 Pectoralis major
 Between anterior chest and greater tubercle of humerus
 Produces flexion at shoulder joint
 Latissimus dorsi
 Between thoracic vertebrae and humerus
 Produces extension at shoulder joint
Pectoralis Major
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Latissimus Dorsi
Appendicular Musculature
 The Rotator Cuff
 Muscles involved in shoulder rotation
 Supraspinatus, subscapularis, infraspinatus, teres
minor, and their tendons
Teres Minor
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Appendicular Musculature
Figure 11–15a (Part 1 of 2) Muscles That Move the Arm.
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Appendicular Musculature
Figure 11–15b Muscles That Move the Arm.
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Appendicular Musculature
[INSERT Table. 11.12]
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Appendicular Musculature
 Muscles That Move the Forearm and Hand
 Originate on humerus and insert on forearm
 Exceptions
 The major flexor (biceps brachii)
 The major extensor (triceps brachii)
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Appendicular Musculature
 Muscles That Move the Forearm and Hand
 Extensors
 Mainly on posterior and lateral surfaces of arm
 Flexors
 Mainly on anterior and medial surfaces
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Appendicular Musculature
 Flexors of the Elbow
 Biceps brachii
 Flexes elbow
 Stabilizes shoulder joint
 Originates on scapula
 Inserts on radial tuberosity
 Brachialis and brachioradialis
 Flex elbow
Biceps Brachii
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Appendicular Musculature
Figure 11–16a Muscles That Move the Forearm and Hand.
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Appendicular Musculature
 Extensors of the Elbow
 Triceps brachii
 Extends elbow
 Originates on scapula
 Inserts on olecranon
 Anconeus
 Opposes brachialis
Triceps Brachii
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Appendicular Musculature
Figure 11–16b Muscles That Move the Forearm and Hand.
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Appendicular Musculature
[INSERT Table. 11.13 top portion]
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Appendicular Musculature
 Flexors of the Wrist
 Palmaris longus
 Superficial
 Flexes wrist
 Flexor carpi ulnaris
 Superficial
 Flexes wrist
 Adducts wrist
 Flexor carpi radialis
 Superficial
 Flexes wrist
 Abducts wrist
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Appendicular Musculature
 Extensors of the Wrist
 Extensor carpi radialis
 Superficial
 Extends wrist
 Abducts wrist
 Extensor carpi ulnaris
 Superficial
 Extends wrist
 Adducts wrist
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Appendicular Musculature
Figure 11–16a Muscles That Move the Forearm and Hand.
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Appendicular Musculature
Figure 11–16b Muscles That Move the Forearm and Hand.
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Appendicular Musculature
[INSERT Table. 11.13 bottom portion]
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Appendicular Musculature
 Muscles That Move the Forearm and Hand
 Pronation and supination
 Pronator teres and supinator
– Originate on humerus and ulna
– Rotate radius
 Pronator quadratus
– Originates on ulna
– Assists pronator teres
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Appendicular Musculature
[INSERT FIG. 11.17a]
Figure 11–16a Muscles That Move the Forearm and Hand.
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Appendicular Musculature
Figure 11–16b Muscles That Move the Forearm and Hand.
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Appendicular Musculature
[INSERT Table. 11.13 middle portion]
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Appendicular Musculature
 Muscles That Move the Hand and Fingers
 Also called extrinsic muscles of the hand
 Lie entirely within forearm
 Only tendons cross wrist (in synovial tendon
sheaths)
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Appendicular Musculature
 Muscles that Move the Hand and Fingers
 Tendon sheaths
 Extensor retinaculum
– Wide band of connective tissue
– Posterior surface of wrist
– Stabilizes tendons of extensor muscles
 Flexor retinaculum:
 Anterior surface of wrist
 Stabilizes tendons of flexor muscles
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Appendicular Musculature
[INSERT FIG. 11.18a]
Figure 11–17a Muscles That Move the Hand and Fingers.
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Appendicular Musculature
Figure 11–17b Muscles That Move the Hand and Fingers.
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Appendicular Musculature
[INSERT FIG. 11.18c]
Figure 11–17c Muscles That Move the Hand and Fingers.
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Appendicular Musculature
[INSERT FIG. 11.18d]
Figure 11–17d Muscles That Move the Hand and Fingers.
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Appendicular Musculature
[INSERT Table. 11.14]
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Appendicular Musculature
 The Intrinsic Muscles of the Hand
 Muscles that move the metacarpals and
phalanges and originate and insert only on
those bones
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Appendicular Musculature
Figure 11–18a Intrinsic Muscles of the Hand.
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Appendicular Musculature
Figure 11–18b Intrinsic Muscles of the Hand.
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Appendicular Musculature
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Appendicular Musculature
 Muscles of the Pelvis and Lower Limbs
 Pelvic girdle is tightly bound to axial skeleton
 Permits little movement
 Has few muscles
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Appendicular Musculature
 Muscles That Position the Lower Limbs
 Muscles that move the thigh
 Muscles that move the leg
 Muscles that move the foot and toes
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Appendicular Musculature
 Muscles That Move the Thigh
 Gluteal muscles
 Lateral rotators
 Adductors
 Iliopsoas
3D Peel-Away of Muscles of the Thigh
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Appendicular Musculature
Figure 11–19a Muscles That Move the Thigh.
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Appendicular Musculature
 Muscles That Move the Thigh: Gluteal Muscles
 Cover lateral surfaces of ilia
 Gluteus maximus
 Largest, most posterior gluteal muscle
 Produces extension and lateral rotation at hip
 Tensor fasciae latae
 Works with gluteus maximus
 Stabilizes iliotibial tract
 Gluteus medius and gluteus minimus
 Originate anterior to gluteus maximus
 Insert on trochanter
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Appendicular Musculature
[INSERT FIG. 11.20b]
Figure 11–19b Muscles That Move the Thigh.
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Appendicular Musculature
[INSERT Table. 11.16 top portion]
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Appendicular Musculature
 Muscles That Move the Thigh
 Lateral rotators
 Group of six muscles, including
– Piriformis
– Obturator
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Appendicular Musculature
[INSERT FIG. 11.20c]
Figure 11–19c Muscles That Move the Thigh.
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Appendicular Musculature
[INSERT Table. 11.16 2nd section]
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Appendicular Musculature
 Muscles That Move the Thigh: Adductors
 Adductor magnus
 Produces adduction, extension, and flexion
 Adductor brevis
 Hip flexion and adduction
 Adductor longus
 Hip flexion and adduction
 Pectineus
 Hip flexion and adduction
 Gracilis
 Hip flexion and adduction
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Appendicular Musculature
[INSERT FIG. 11.21b]
Figure 11–20b Muscles That Move the Leg.
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Appendicular Musculature
[INSERT FIG. 11.20d]
Figure 11–19d Muscles That Move the Thigh.
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Appendicular Musculature
[INSERT Table. 11.16 3rd section]
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Appendicular Musculature
 Muscles That Move the Thigh: Iliopsoas
 Two hip flexors insert on the same tendon
 Psoas major
 Iliacus
Iliopsoas
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Appendicular Musculature
[INSERT FIG. 11.20d]
Figure 11–19d Muscles That Move the Thigh.
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Appendicular Musculature
[INSERT Table. 11.16 bottom]
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Appendicular Musculature
 Muscles That Move the Leg
 Flexors of the knee
 Originate on the pelvic girdle
 Extensors of the knee
 Originate on the femoral surface
 Insert on the patella
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Appendicular Musculature
 Flexors of the Knee
 Hamstrings
 Biceps femoris
 Semimembranosus
 Semitendinosus
 Sartorius
 Originates superior to the acetabulum
 Popliteus
 Rotates the tibia to unlock the knee
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Appendicular Musculature
Figure 11–20a Muscles That Move the Leg.
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Appendicular Musculature
[INSERT Table. 11.17 top portion]
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Appendicular Musculature
 Muscles That Move the Leg
 Extensors of the knee
 Four muscles of the quadriceps femoris
– Three vastus muscles
– Rectus femoris muscle
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Appendicular Musculature
[INSERT FIG. 11.21b]
Figure 11–20b Muscles That Move the Leg.
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Appendicular Musculature
[INSERT Table. 11.17 bottom]
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Appendicular Musculature
Figure 11–20c Muscles That Move the Leg.
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Appendicular Musculature
 Muscles That Move the Foot and Toes
 Extrinsic muscles that move the foot and toes include
 Muscles that produce extension at the ankle
 Muscles that produce flexion at the ankle
 Muscles that produce extension at the toes
 Muscles that produce flexion at the toes
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Appendicular Musculature
 Four Muscles That Produce Extension (plantar
flexion) at the Ankle
 Gastrocnemius
 Soleus
 Fibularis (group)
 Tibialis posterior
3D Peel-Away of Muscles of the Leg and Foot
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Appendicular Musculature
Figure 11–21a Extrinsic Muscles That Move the Foot and Toes.
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Appendicular Musculature
[INSERT FIG. 11.22b]
Figure 11–21b Extrinsic Muscles That Move the Foot and Toes.
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Appendicular Musculature
 Muscles That Move the Foot and Toes
 The Achilles Tendon
 The calcaneal tendon (Achilles tendon)
– Shared by the gastrocnemius and soleus
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Appendicular Musculature
 Muscles That Produce Flexion
(Dorsiflexsion) at the Ankle
 Tibialis anterior
 Opposes the gastrocnemius
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Appendicular Musculature
 Muscles That Produce Extension at the
Toes
 Extensor digitorum longum
 Extensor hallucis longus
 Extensor retinacula: fibrous sheaths hold tendons
of toes as they cross the ankle
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Appendicular Musculature
[INSERT FIG. 11.22b]
Figure 11–21b Extrinsic Muscles That Move the Foot and Toes.
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Appendicular Musculature
[INSERT FIG. 11.22d]
Figure 11–21d Extrinsic Muscles That Move the Foot and Toes.
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Appendicular Musculature
 Muscles That Produce Flexion at the Toes
 Flexor digitorum longum
 Flexor hallucis longus
 Oppose the extensors
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Appendicular Musculature
Figure 11–21c Extrinsic Muscles That Move the Foot and Toes.
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Appendicular Musculature
[INSERT Table. 11.18]
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Appendicular Musculature
[INSERT Table. 11.18]
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Appendicular Musculature
 The Intrinsic Muscles of the Foot
 Muscles that move the tarsals, metatarsals,
and phalanges and originate and insert only
on those bones
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Appendicular Musculature
Figure 11–22a Intrinsic Muscles of the Foot.
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Appendicular Musculature
[INSERT FIG. 11.23b]
Figure 11–22b Intrinsic Muscles of the Foot.
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Appendicular Musculature
[INSERT FIG. 11.23c]
Figure 11–22c Intrinsic Muscles of the Foot.
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Appendicular Musculature
[INSERT Table. 11.19]
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Effects of Aging on the Muscular System
 Skeletal muscle fibers become smaller in
diameter
 Skeletal muscles become less elastic
 Develop increasing amounts of fibrous tissue
(fibrosis)
 Decreased tolerance for exercise
 Decreased ability to recover from
muscular injuries
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Effects of Aging on the Muscular System
Figure 11–23 Musculoskeletal Compartments.
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Integration with Other Systems
 Cardiovascular system
 Delivers oxygen and fuel
 Removes carbon dioxide and wastes
 Respiratory system
 Responds to oxygen demand of muscles
 Integumentary system
 Disperses heat from muscle activity
 Nervous and endocrine systems
 Direct responses of all systems
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Integration with Other Systems
Figure 11–24 Functional Relationships Between the Muscular System
and Other Systems.
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