lengthening reaction


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Related to lengthening reaction: chloropia

lengthening reaction

 [leng´then-ing]
reflex elongation of extensor muscles that permits flexion of a limb.

length·en·ing re·ac·tion

in the decerebrate animal, the rather sudden relaxation with lengthening of the extensor muscles when a limb is passively flexed; associated with clasp-knife spasticity.