Pectoralis major muscle

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Description:

Origin:
Sternal half of clavicle, anterior surface of sternum and costal cartilages 1 to 7

Insertion:
Lateral ridge of the intertubercular groove of the humerus

Actions:
Adducts and rotates the shoulder joint inward

Nerve supply:
Medial and lateral pectoral nerves

Blood supply:
Branches of the axillary artery