basal joint reflex
A reflex of the thumb in which the metacarpophalangeal joint flexes and the interphalangeal joint extends in response to firm passive flexion of the third, fourth, or fifth finger.finger-thumb reflex Mayer's reflex
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.