Advertisement Upgrade to remove ads

Origin, Insertion, Action

Sternocleidomastoid

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

masseter

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

sartorius

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

semitendinosus

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

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set