Dictionary.com
definitions

metacarpal artery

n.
  1. Any of four arteries on the dorsal surface of the carpus; dorsal metacarpal artery.
  2. Any of three arteries that spring from the deep palmar arch and anastomose with the dorsal metacarpal arteries; palmar metacarpal artery.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.