principal artery of thumb
(prĭn′sə-pəl)- An artery with origin in the radial artery, with distribution to the palmar surface and sides of the thumb, and with anastomoses to the arteries on the dorsum of the thumb.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.