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Origin, Insertion, Action


O: manubrium of sternum; medial portion of clavicle
I: mastoid process of temporal bone & occipital bone
A: flexes head; tilts head toward shoulder

Serratus Anterior

O: ribs 1-8
I: anterior surface of vertebral border of scapula
A: holds scapula against chest wall; rotates scapula; abduction of arm


O: zygomatic arch & maxilla
I: ramus of mandible
A: elevates mandible

levator scapulae

O: transverse process of C1- C4
I: medial border of the scapula superior to spine
A: elevates/adducts scapula

biceps brachii

short head- O: coracoid process
long head- O: tubercle of glenoid cavity
I: common tendon into radial tuberosity
A: flexes elbow; supinates forearm

pronator teres

O: medial epicondyle of humerus; coronoid process of ulna
I: lateral radius; midshaft
A: pronates forearm

flexor carpi ulnaris

O: medial epicondyle of humerus; olecranon process of ulna
I: pissiform and hamate bones; 5th metacarpal
A: powerful flexor of wrist; adduct hand

extensor digitorum

O: lateral epicondyle of humerus
I: 4 tendons to distal phalanges of fingers 2-5
A: extends phalanges; extends wrist


O: anterior superiod iliac spine
I: medial aspect of proximal tibia
A: flexes, abducts, & laterally rotates thigh; flexes knee

gluteus maximus

O: dorsal ilium, sacrum, coccyx
I: gluteal tuberosity of femur; iliotibial tract
A: major extensor/abductor of thigh

biceps femoris

O: - long: ischial tuberosity
- short: linea aspera & distal femur
I: common tendon that inserts into head of fibula & lateral condyle of tibia
A: extends hip & flexes knee


O:ishcial tuberosity
I: medial aspect of upper tibial shaft
A: extends thigh & hip; flexes knee

rectus femoris

O: anterior inferior iliac spine & superior margin of acetabulum
I: patella & tibial tuberosity
A: flexes hip & extends knee

vastus lateralis

O: greater trochanter, intertrochanteric line, linea aspera
I: patella & tibial tuberosity
A: extends & stabilizes knee

adductor magnus

O: ischial & pubic ramus & ischial tuberosity
I: linea aspera & tubercle of femur
A: adducts & medially rotates & flexes thigh

tibialis anterior

O: lateral condyle & upper tibial shaft
I: inferior surfaces of medial cuneiform & 1st metatarsal bone
A: dorsiflexion & inversion of foot

peroneus longus (fibularis)

O: upper portion of lateral fibula
I: by tendon that curves under 1st metatarsal & medial cuneiform bone
A: plantar flexion & everts foot

internal oblique

O: lumbar fascia, iliac crest, inguinal ligament
I: linea alba; pubic crest, last 3 or 4 ribs
A: flexing vertebral column & compressing abdominal wall

rectus abdominis

O: pubic crest & symphysis
I: xiphoid process & costal cartilages of ribs 5-7
A: flex & rotate lumbar region of vertebral column; compresses abdomen; retracts ribs & sternum

pectoralis major

O: clavicle, sternum, ribs 1-6
I: intertubicular groove of humerus
A: arm flexion; rotates arm medially, adducts arm; rib cage upward

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