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 long, thin, ribbon-shaped muscle situated on the external surface of the throat in contact with the parotid gland.
Origin. - From the outer surface of the parotid gland, from which it ascends to be inserted into the outer part of the base of the concha, immediately beneath the opening.
Action. - To abduct or move the ear outward.
 
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