Chaddock sign

Chad·dock sign

(chad'ok),
when the lateral malleolar skin area is irritated, extension of the great toe occurs in cases of organic disease of the corticospinal reflex paths.
Synonym(s): Chaddock reflex

Chaddock sign

or

Chaddock reflex

(chăd′ək)
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.

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.

chad·dock sign

, Chaddock reflex (chad'ŏk sīn, rē'fleks)
When the external malleolar skin area is irritated, extension of the great toe occurs in cases of organic disease of the corticospinal reflex paths.

Chaddock,

Charles G., U.S. neurologist, 1861-1936.
Chaddock reflex - Synonym(s): Chaddock sign
Chaddock sign - when the external malleolar skin area is irritated, extension of the great toe occurs in cases of organic disease of the corticospinal reflex paths. Synonym(s): Chaddock reflex; external malleolar sign
References in periodicals archive ?
On day 12 of admission, aphasia, left limb weakness, positive bilateral Chaddock sign, and a fever of 38.6[degrees]C were presented in this patient.
The most frequently-found upper neuron sign was hyperactive and asymmetric deep tendon reflex (32.3%), followed by the Chaddock sign (12.9%), Hoffman sign (9.7%) and the Babinski sign (3.2%).
Goetz CG (2002) History of the extensor plantar response: Babinski and Chaddock signs. Seminars in Neurology 22(4): 391-398.