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retinaculum of flexor muscles

n.
  1. A wide band that passes from the medial malleolus to the calcaneus and to the plantar surface as far as the navicular bone and holds in place the tendons of the posterior tibial muscle, the long flexor muscle of the toes, and the long flexor muscle of the big toe.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.