tibial nerve

n.
  1. One of two major divisions of the sciatic nerve, supplying the hamstring muscles, the muscles of the back of the leg, the muscles of the plantar aspect of the foot, and the skin on the back of the leg and on the sole of the foot.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.