Muscles of shoulder & arm (origin, insertion, action, innervation)

Latissimus Dorsi

O: Ilium, ribs I: Humerus A: Extend and Rotate arm (EXTENSOR)

pectoralis major

O: clavicle, sternum, ribs I: humerus A: Flex and rotate humerus (FLEXOR)

Trapezius

origin - nuchal line, occipital bone insertion -clavicle, scapula function - extend head, rotate scapula and fixes scapula

Pectoralis Minor

origin - ribs insertion - scapula function - depress scapula (glenoid cavity)

Biceps Brachii

origin - scapula insertion - radius function - flex arm and forearm, supinates hand FLEXOR

Deltoid

origin - scapula, clavicle insertion - humerus function - flex and extends arm (also rotate)

Triceps Brachii

origin - scapula, humerus insertion - ulna function - extend arm and forearm (EXTENSOR)

Brachialis

origin -humerus insertion - ulna function - Flexes forearm

teres major

origin- scapula insertion- humerus action- EXTENSOR = extends and rotates arm

teres minor

origin- scapula insertion-humerus action- stabilize shoulder joint, rotates arm