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clasp-knife phenomenon

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Chapter 7 - Discussion of the Upper Motor Neuron Syndrome
Robert Laureno, Georgetown University, Washington DC
Book:

Insights into Clinical Neurology

Published online:

27 July 2023

Print publication:

20 July 2023, pp 44-47
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Summary

In the upper motor neuron syndrome, there are abnormalities of spinal reflexes. The disordered monosynaptic muscle stretch reflex is manifest by a velocity dependent increase in muscle tone and exaggerated tendon jerks. The cutaneous reflex to plantar stimulation is abnormal in that plantar flexion of the great toe is lost. Disinhibition of the polysynaptic spinal flexion reflex is responsible for the Babinski sign and the clasp-knife phenomenon.