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chin muscle

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n.
A muscle with origin from the incisor fossa of the mandible, with insertion into the skin of the chin, with nerve supply from the facial nerve, and whose action raises and wrinkles the skin of the chin and pushes up the lower lip.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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