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chad·dock sign, Chaddock reflex (chad'ŏk sīn, rē'fleks)
Chaddock,Charles G., U.S. neurologist, 1861-1936.
responsereactive tissue response to stimulus
Chaddock response provocation of extensor plantar response (in cases with upper motor neurone lesion) by stroking lateral side of lower leg from proximal to distal (compare with response, extensor plantar)
extensor plantar response; Babinski response; Babinski reflex slow, reflex dorsiflexion of hallux at first metatarsophalangeal joint, with fanning of lesser toes, and plantarflexion of fourth and fifth toes at 4/5 metatarsophalangeal joints when plantar skin is stimulated; normal in infants up to 7 months old; diagnostic of upper motor neurone lesion in older subjects (see sign, Babinski's; response, Chaddock; response, Gordon; response, Oppenheim)
Gordon response provocation of extensor plantar response, by squeezing posterior calf area; indicative of upper motor neurone lesion
Oppenheim response; Oppenheim reflex provocation of extensor plantar response, by stroking either side of tibial crest from proximal to distal; indicative of upper motor neurone lesion