finger-thumb reflex


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ba·sal joint re·flex

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.

finger-thumb reflex

ba·sal joint re·flex

(bā'săl joynt rē'fleks)
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 present normally but is absent in pyramidal lesions.
Synonym(s): finger-thumb reflex, Mayer reflex.