Pectoralis major:
- Originates on the medial half of the clavicle, the sternum, and first 6 ribs.
- Inserts on the lateral lip of the intertubercular groove of the humerus
- Flexes, adducts, and medially rotates the humerus.
- Comprises the bulk of the anterior thoracic wall.
- Cephalic vein traverses superficially along superolateral border of pectoralis major.
Pectoralis Major (Photo)
Photos: https://sites.google.com/a/umich.edu/bluelink/resources/bluelinks/unlabeled-deep-back-and-spinal-cord-images