long palmar muscle

n.
  1. A muscle with origin from the humerus, with insertion into the flexor retinaculum and the palmar fascia, with nerve supply from the median nerve, and whose action tenses the palmar fascia and flexes the hand and forearm.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.