Reflex - Babinski's; Extensor plantar reflex; Babinski's sign
Babinski's reflex occurs when the big toe moves toward the top surface of the foot and the other toes fan out after the sole of the foot has been firmly stroked.
This reflex, or sign, is normal in very young children. It is not normal after age 2.
Reflexes are predictable, uncontrollable responses to a certain type of stimulation.
Babinski's reflex is one of the reflexes that occurs in infants. It is normal in children up to 2 years old, but it disappears as the child gets older and the nervous system becomes more developed. It may disappear as early as 12 months.
The presence of a Babinski's reflex after age 2 is a sign of damage to the nerve paths connecting the spinal cord and the brain (the corticospinal tract). This tract runs down both sides of the spinal cord. A Babinski's reflex can occur on one side or on both sides of the body.
An abnormal Babinski's reflex can be temporary or permanent.
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Murray B, Mitsumoto H. Disorders of the upper and lower motor neurons. In: Bradley WG, Daroff RB, Fenichel GM, Jankovic J, eds. Bradley: Neurology in Clinical Practice. 5th ed. Philadelphia, Pa: Butterworth-Heinemann Elsevier; 2008:chap 78.
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