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 narrow muscle tapering towards the extremities, and situated on the internal face of the shoulder.
Origin. - From the posterior or dorsal angle of the scapula, and from the fascia underlying the subscapularis in front of it.
Insertion. - With the latissimus dorsi, into a small tubercle on the inner surface of the humerus.
Action. - To flex the humerus on the shoulder and rotate it inwards.
 
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