clonic

clonic /clon·ic/ (klon´ik) pertaining to or of the nature of clonus.

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clon·ic (klnk, klnk)

adj.

Of the nature of clonus, marked by contraction and relaxation of muscle.

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clonic

[klon′ik]

Etymology: Gk, klonos, tumult

pertaining to increased reflex activity, as in upper motor neuron lesions when repetitive muscular contractions and relaxations in rapid succession are induced by stretching. See also clonus.

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clonus [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.

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.

toe clonus abnormal rhythmic contraction of the great toe, induced by sudden passive extension of its first phalanx.

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

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clonic (klon´ik),

n the alternating pattern of releasing and tightening a muscle.

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clonic

pertaining to or characterized by clonus, e.g. clonic convulsions.

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clonic-tonic

a seizure in which there are clonic and tonic phases with jerking and flexing of muscles alternating with relaxation.

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clonic

adjective Pertaining to clonus, see there