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palmar arch

n.
  1. The deep arterial arch located below the long flexor tendons in the hand, formed by the radial artery in conjunction with the deep palmar branch of the ulnar artery.
  2. The superficial arterial arch in the hand located above the long flexor tendons, formed principally by the ulnar artery and usually completed by a communication with the superficial palmar branch of the radial artery.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.