Download Hamstrings: Knee Flexion

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SKELETAL MUSCLE
LAB
BIO 137 Anatomy & Physiology I
Muscle Attachments
• Origin
• Anchored, immovable end of muscle
• Insertion
• Moveable end of muscle
• During contraction, the insertion moves toward the origin
Radial tuberosity
MUSCLE ACTIONS
Types of Joint Movements
• Flexion
• Extension
• Dorsiflexion
• Plantar Flexion
• Hyperextension
Types of Joint Movements
• Abduction
• Adduction
Types of Joint Movements
• Rotation
• Circumduction
• Supination
• Pronation
Types of Joint Movements
• Eversion
• Inversion
• Protraction
• Retraction
Types of Joint Movements
• Elevation
• Depression
Skeletal Muscles
• Skeletal muscles usually function in groups
• Most movements use more than 1 muscle
Functional groups of muscles
• Prime mover (agonist)
• Muscle primarily responsible for the action of a movement
• Biceps brachii in elbow flexion
• Synergist
• Muscles that contract and assist the prime mover in an
action
• Brachialis and brachioradialis in elbow flexion
• Antagonist
• Muscle that works opposite the prime mover
• Triceps brachii that works in the opposite direction as biceps brachii
IDENTIFYING
SKELETAL MUSCLES
For each skeletal muscle studied
• Identify the muscle
• Locate the muscle in the body
• Name the action of the muscle
Muscles of Facial Expression
• Epicranius
• Frontalis
• Occipitalis
• Orbicularis oculi
• Zygomaticus
• Orbicularis oris
• Buccinator
Frontalis
Occipitalis
Orbicularis oculi
Zygomaticus
Orbicularis oris
Buccinator
MUSCLES OF
MASTICATION
Masseter
Temporalis
Both elevate the
mandible
Platysma
Lateral Pterygoid
Both depress the
mandible
Temporalis
Masseter
Platysma
Depression of Mandible
Lateral
Pterygoid
MUSCLES THAT MOVE
THE HEAD
Sternocleidomastoid
Sternocleidomastoid
Sternocleidomastoid
MUSCLES THAT MOVE
THE PECTORAL GIRDLE
Trapezius
Pectoralis minor
Serratus anterior
Closely associated with those that move the arm
Trapezius
Pectoralis minor
Serratus
anterior
MUSCLES THAT MOVE
THE ARM (HUMERUS)
Pectoralis major
Deltoid
Latissimus dorsi (dorsal)
Deltoid
Pectoralis
major
Latissimus
dorsi
MUSCLES THAT MOVE
THE FOREARM
Biceps brachii
Brachialis
Brachioradialis
Triceps brachii
Biceps
brachii
Brachialis
Brachioradialis
MUSCLES THAT MOVE
THE HAND, WRIST, AND
FINGERS
Flexor carpi radialis
Flexor carpi ulnaris
Extensor digitorum
Flexor carpi
radialis
Flexor carpi
ulnaris
Ventral View
Extensor
digitorum
MUSCLES OF THE
ABDOMINAL WALL
Rectus abdominis
External oblique
Internal oblique
Transversus abdominis
MUSCLES THAT MOVE
THE THIGH (FEMUR)
Gluteus maximus
Gluteus medius
Adductor longus
Gracilis
Gluteus medius
Gluteus maximus
Adductor
longus
Gracilis
Gracilis
MUSCLES THAT MOVE
THE LOWER LEG
(TIBIA AND FIBULA)
Hamstrings – knee flexion
Quadriceps - knee extension
Sartorius – flexion of hip and lateral rotation
Muscles that flex the knee and move the
lower leg: Hamstrings
• Knee flexion
• Dorsal muscle group
• Biceps femoris
• Semitendinosus
• Semimembranosus
Hamstrings:
Knee Flexion
Semitendinosus
Biceps femoris
Semimembranosus
Semimembranosus
Biceps femoris
Semitendinosus
Biceps femoris
Flexion of the leg
at the hip and
lateral rotation:
Sartorius
Sartorius
Muscles that extend the knee: Quadriceps
• Knee extension
• Ventral muscle group
• Made up of four muscles:
• Vastus lateralis
• Rectus femoris
• Vastus medialis
• Vastus intermedius
Rectus femoris
Vastus lateralis
Vastus
medialis
Vastus intermedius
Deep to other muscles
MUSCLES THAT MOVE
THE FOOT AND TOES
Gastrocnemius
Fibularis longus
Tibialis anterior
Muscles that move the foot
• Dorsal flexion: Tibialis anterior
• Plantar flexion: Gastrocnemius
• Eversion: Fibularis longus
• Inversion: Tibialis anterior
Fibularis longus
Tibialis anterior
Gastrocnemius
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