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 muscle, anatomy, muscle picture

Pectoralis Major Video

Pectoralis Major Muscle

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