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Origin, Insertion and Action of Selected Skeletal Muscles
origin - attachment point of the muscle that does not move during muscular contraction
insertion - attachment that moves during contraction
action - effect the muscle has on a part of the body
masseter
temporalis
Insertion
Action
posterior 1/3 mandible elevates mandible
coronoid process of
mandible
elevates mandible
hyoid bone
depresses mandible
single: rotate head to
opposite side; both: flex head
sternocleidomastoid
manubrium and
medial clavicle
mastoid process of
temporal bone
rectus abdominis
pubic symphysis
xiphoid process, costal flexes vertebral column,
cartilages of ribs 5-7
compresses abdomen
trapezius
occipital bone, dorsal clavicle, scapula
spinous processes
(acromion process,
(thoracic vertebrae) spine)
extends head; elevates
scapula
latissimus dorsi
dorsal spine (T7 to
sacrum), iliac crest
humerus (proximal 1/3)
extends arm; adducts and
medially rotates arm
rhomboids (major &
minor)
dorsal spinous
processes of C7-T5
medial border of
scapula
adducts scapula
deltoid
clavicle, acromion
process, spine of
scapula
deltoid tuberosity of
humerus
abducts arm
triceps brachii
scapula and humerus
olecranon process of
ulna
extends forearm
Muscles of the
Medial Thigh
Anterior Muscles
Acting on the
Shoulder, Arm or
Forearm
Posterior Muscles Acting on the Shoulder,
Arm or Forearm
Neck
Muscles
digastric
Origin
zygomatic bone
(zygomatic arch)
temporal bone
(temporal fossa)
inferior mandible,
temporal
Abdominal
Muscles
Muscles of
Mastication
Muscles
pectoralis major
biceps brachii
clavicle, sternum,
greater tubercle of
costal cartilages of
humerus
ribs 1-7
coracoid process and
supraglenoid tubercle radial tuberosity
of scapula
flexes arm; adducts, and
medially rotates arm
flexes forearm
iliopsoas
transverse processes lesser trochanter of
of T12-L5; iliac fossa femur
major flexor of thigh
sartorius
anterior superior iliac
proximal tibia
spine
flexes and laterally rotates
thigh
WCJC Biology 2401
Rev 082110
PAGE 17
Origin, Insertion and Action of Selected Skeletal Muscles
Insertion
Action
extends leg (rectus femoris
also flexes thigh)
ilium (rectus femoris)
tibial tuberosity
and femur
hamstrings
ischial tuberosity
head of fibula, proximal
extends thigh, flexes leg
1/3 tibia
gluteus maximus
iliac crest, sacrum,
coccyx
proximal 1/3 femur
extends thigh
tibialis anterior
lateral condyle and
upper 2/3 of tibia
metatarsal 1
dorsiflexion
gastrocnemius
condyles of femur
calcaneus
plantar flexes (extends) foot
Muscles of
the
Posterior
Thigh
quadriceps femoris
muscles
Muscles
of the
Anterior
Leg
Origin
Muscles of
the
Posterior
Leg
Muscles of
the Anterior
Thigh
Muscles
WCJC Biology 2401
Rev 082110
PAGE 18