Coracobrachialis

A

Action:  Flexes and adducts the arm

Subscapularis

A

Deltoid

OIA

Origin:  Acromion process, spine of scapula, and the clavicle

Insertion:  Deltoid tuberosity of humerus

Action:  Abducts, extends, and flexes arm

Supraspinatus

A

Infraspinatus

A

Action:  Rotates arm laterally

Teres Major

A

Action:  Extends, adducts and rotates arm medially

Latissimus Dorsi

OIA

Origin:  Spines of sacral, lumbar, and lower thoracic vertebrae, iliac crest, and lower ribs

Insertion:  Intertubercular groove of the humerus

Action:  Extends, adducts, and rotates the arm medially, or pulls the shoulder downward and back.

Teres Minor

A

Pectoralis Major

OIA

Origin:  Clavicle, sternum, and costal cartilages of upper ribs

Insertion:  Intertubercular groove of humerus

Action:  Flexes, adducts, and rotates arm medially