Babinski sign

Definition

The Babinski sign is a reflex action observed in the foot, characterized by the upward extension of the big toe and fanning out of the other toes when the sole of the foot is stimulated. It is an important neurological examination finding that indicates damage to the corticospinal tract.

Related terms

Corticospinal tract: A collection of nerve fibers in the central nervous system that transmits movement-related information from the brain to the spinal cord.

Reflex action: An involuntary and nearly instantaneous movement in response to a stimulus, which does not involve conscious thought.

Neurological exam: A series of tests performed to assess nervous system function, including sensory and motor responses