MOD

Origin: medial calvical, sternum, ribs 1-7

Insertion: bicipital groove of the humerus

Action: flextion, medial rotation & adduction of the humerus

Origin: ribs 3-5

Insertion: coracoid process of the scapula

Action: depress, protracts, downward rotates the scapula & elevates ribs

Origin: lateral third of the calvicle

Insertion: deltoid tuberosity

Action: flextion & medial rotation of the shoulder

Origin: acromion process on the scapula

Insertion: deltoid tuberosity

Action: abduction of the shoulder

Origin: scapular spine

Insertion: deltoid tuberosity

Action: extension & lateral rotation of the should