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lateral pterygoid muscle

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n.
A muscle whose inferior head has origin from the pterygoid process, and whose superior head has origin from the sphenoid bone, with insertion into the mandible and the articular disk, with nerve supply from the lateral pterygoid branch of the trigeminal nerve, and whose action brings the jaw forward and opens it.
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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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