clonus

clonus /clo·nus/ (klo´nus)

1. alternate involuntary muscular contraction and relaxation in rapid succession.

2. a continuous rhythmic reflex tremor initiated by the spinal cord below an area of spinal cord injury, set in motion by reflex testing.clon´ic

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ankle clonus , foot clonus a series of abnormal reflex movements of the foot, induced by sudden dorsiflexion, causing alternate contraction and relaxation of the triceps surae muscle.

wrist clonus  spasmodic movement of the hand, induced by forcibly extending the hand at the wrist.

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clo·nus (klns)

n. pl. clo·nus·es

A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession, after forcible extension or flexion of a part. Also called clonospasm.

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clonus

[klō′nəs]

Etymology: Gk, klonos, tumult

an abnormal pattern of neuromuscular activity, characterized by rapidly alternating involuntary contraction and relaxation of skeletal muscle. Compare tonus. clonic, adj.

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clonus (klōˑ·ns),

n abnormal neuromuscular activity marked by the involuntary relaxation and contractions of the skeletal muscles.

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clonus (klō´ns),

n an alternating muscular spasm and relaxation in rapid succession.

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clonus

alternate involuntary muscular contraction and relaxation in rapid succession. A sign of upper motor neuron disease.

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clonus

Neurology 1. A volley of muscle contractions and relaxations, occurring in rapid succession 2. An abrupt transient muscle contraction