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Medical Term:

basal joint reflex


opposition and adduction of the thumb with flexion at its metacarpophalangeal joint and extension at its interphalangeal joint, when firm passive flexion of the third, fourth, or fifth finger is made; the reflex is normally present but absent in pyramidal lesions.

Synonym(s): finger-thumb reflex, Mayer reflex

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.