A broad, flat muscle covering over the internal face of the scapula or blade-bone, where it is lodged in a hollow or "fossa", which it fills.

Origin. - From the internal surface of the scapula.

Insertion. - Into the inner tuberosity on the head of the humerus. A small synovial bursa is interposed between the tendon and the bone.

Action. - To adduct or draw the shoulder towards the body.