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third peroneal muscle

n.
  1. A muscle with origin in common with the long extensor muscle of the toes, with insertion into the base of the fifth metatarsal bone, with nerve supply from a branch of the peroneal nerve, and whose action assists in the dorsal flexion of the foot.third fibular muscle
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.