Chad·dock sign (ch d  k)n. Extension of the big toe in response to irritation of the skin covering the malleolus of the ankle joint, observed in organic disease of the corticospinal reflex paths. Also called Chaddock reflex. |
Chaddock sign
Neurology Great toe extension by stroking the skin over the external malleolus, an indicator of corticospinal tract lesions–eg, MS. Cf Babinski sign.
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