plantar muscle

n.
  1. A muscle with origin from the femur, with insertion to the tendon and the deep fascia of the ankle, with nerve supply from the tibial nerve, and whose action causes the plantar flexion of the foot.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.