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Babinski reflex (sign) [bah-bin´ske]
a reflex action of the toes, normal during infancy but abnormal after 12 to 18 months of age; after locomotion begins, it is indicative of abnormalities in the motor control pathways leading from the cerebral cortex and is widely used as a diagnostic aid in disorders of the central nervous system. It is elicited by a firm stimulus (usually scraping) on the sole of the foot, which results in dorsiflexion of the great toe and fanning of the smaller toes. Normally such a stimulus causes all the toes to bend downward.
Normal and Babinski reflexes. A, Line of stimulation: Outer sole, heel to little toe. B, Plantar (normal) reflex. Toes curl inward. C, Positive Babinski reflex (always abnormal). Great toe bends upward; smaller toes fan outward.
Ba·bin·ski sign (bă-bin'skē),
2. in hemiplegia, weakness of the platysma muscle on the affected side, as is evident in such actions as blowing or opening the mouth;
3. when the patient is lying supine, with arms crossed on the front of the chest, and attempts to assume the sitting posture, the thigh on the side of an organic paralysis is flexed and the heel raised, whereas the limb on the sound side remains flat;
4. in hemiplegia, the forearm on the affected side turns to a pronated position when placed in a position of supination.
Babinski reflex (bə-bĭn′skē) also
Babinski's reflex (-skēz)
An extension of the great toe, sometimes with fanning of the other toes, in response to stroking of the sole of the foot. It is a normal reflex in infants, but it is usually associated with a disturbance of the pyramidal tract in children and adults. Also called Babinski sign, Babinski's sign.
Babinski sign A reflex movement of the big toe upward instead of downward when the plantar aspect of the foot is stroked, a manoeuvre used to test injury to, or diseases of, the upper motor neurons.
Babinski, Joseph François Félix, French neurologist, 1857-1932.
Babinski-Nageotte syndrome - brain lesions resulting in Horner syndrome.
Babinski phenomenon - Synonym(s): Babinski sign (1)
Babinski reflex - Synonym(s): Babinski sign (1)
- (1) extension of the great toe and abduction of the other toes instead of normal flexion reflex to plantar stimulation. Synonym(s): Babinski phenomenon
; Babinski reflex
; Babinski test
; - (2) in hemiplegia, weakness of platysma muscle on affected side. - (3) when patient is in supine position with hands crossed on chest and attempts to sit up, the thigh on the side of an organic paralysis is flexed and heel raised, whereas unaffected side remains flat; - (4) in hemiplegia, the forearm on the affected side turns to a pronated position when placed in a position of supination.
Babinski syndrome - the combination of cardiac, arterial, and central nervous system manifestations of tertiary syphilis.
response reactive tissue response to stimulus
Babinski response see response, extensor plantar
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
a reflex action of the toes, indicative of abnormalities in the motor control pathways leading from the cerebral cortex. It is elicited in dogs and cats by an upward stroking of the metacarpal or metatarsal bones. A normal reaction is slight flexion of the toes. In a positive sign, the toes extend; seen with upper motor neuron lesions. Called also Babinski sign.