Pectoral Major muscle

Beginning: the medial part of the clavicle, the sternum and the first six ribs.

Attachment: crista tuberculi majoris humeri.

Innervation: nn. pectorales laterales (C5–C7); mediales (C8,Th1) – pars supraclavicularis plexus brachialis.

Function: clavicular part - auxiliary function during forearm pronation.
 * Sternocostal and abdominal part - adduction, internal rotation.
 * Accessory inspiratory muscle.

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