Babinski sign
Pronunciation: bah-BIN-skee
An abnormal plantar reflex indicating upper motor neuron dysfunction, characterized by upward movement of the big toe.
Full Definition
The Babinski sign is a pathological reflex that indicates damage to the corticospinal tract or other upper motor neuron pathways. It is elicited by firmly stroking the lateral aspect of the sole of the foot from heel to toe; a positive response consists of dorsiflexion (upward movement) of the big toe, often accompanied by fanning of the other toes. While normal in infants under 12 months, the Babinski sign is always abnormal in adults and suggests central nervous system pathology such as stroke, spinal cord injury, or neurodegenerative disease.
Usage
Usage note: Named after neurologist Joseph Babinski. Always capitalize when referring to the specific sign.
In Context
- "Neurological examination revealed a positive Babinski sign on the right, consistent with left hemispheric stroke." — Clinical assessment
- "The presence of bilateral Babinski signs suggested spinal cord compression at the cervical level." — Neurological consultation