This section is from the book "The Horse - Its Treatment In Health And Disease", by J. Wortley Axe. Also available from Amazon: The Horse. Its Treatment In Health And Disease.
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.
 
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