ankle 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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ankle clonus,

an involuntary tendon reflex that causes repeated flexion and extension of the foot. It may be caused by pressure on the foot or corticospinal disease. More than four beats of clonus is pathologic.

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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.