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semitendinous muscle

(sĕm′ē-tĕndə-nəs, sĕm′ī-)
n.
  1. A muscle with origin from the ischial tuberosity, with insertion into the medial surface of the upper quarter of the shaft of the tibia, with nerve supply from the tibial nerve, and whose action extends the thigh, flexes the leg, and rotates it medially.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.