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 short muscle on the outer aspect of the shoulder and arm.
Origin. - By a broad sheet of tendon from the scapular fascia, and from the posterior or dorsal angle of the scapula.
Insertion. - Into the external tubercle of the humerus.
Action. - To flex the humerus on the scapula and rotate it outwards.
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