PECTORALIS MAJOR

Pectoralis Major muscle

Origin of Pectoralis Major

Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle.

Insertion of Pectoralis Major

Lateral lip of intertubercular groove of humerus.

Muscle Action/Function of Pectoralis Major

Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly; Acting alone: clavicular head flexes humerus and sternocostal head extends it.

Arterial (Blood) Supply of Pectoralis Major

Pectoral branch of the thoracoacromial trunk.

Pectoralis Major Video

Pectoralis Major Muscle

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