clasp-knife rigidity

Quick Reference

A form of muscular spasm or exaggerated muscle tonus in a limb or body part that resists passive movement and then suddenly gives way, in the manner of a jackknife. It is indicative of a lesion in the corticospinal tract. See also decerebrate rigidity. Compare catalepsy, cerea flexibilitas, cogwheel rigidity.

Subjects: Psychology.

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