crossed extension reflex


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Related to crossed extension reflex: trunk incurvation reflex

crossed ex·ten·sion re·flex

extension of the contralateral hind limb when the paw of an animal is painfully stimulated or the central cut end of an afferent nerve, for example, the peroneal, is stimulated; sometimes occurs in humans on tapping the skin.

crossed extension reflex

one of the spinally mediated reflexes normally present in the first 2 months of life, demonstrated by the adduction and extension of one leg when the foot of the other leg is stimulated. When present in adults, it indicates hyperactive reflexes.
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Crossed extension reflex

cross·ed ex·ten·sion re·flex

(krawst eks-ten'shŭn rē'fleks)
A spinal level reflex elicited by application of a noxious stimulus, distally, to an extremity fixed in extension (commonly, the foot) with the patient supine. The response is for the opposing extremity to flex, then adduct and extend.

crossed extension reflex

An extension of the lower extremity on the opposite side when a painful stimulus is applied to the skin.
See also: reflex