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clonus (kloŽnәs)   alternate involuntary muscular contraction and relaxation in rapid succession.
  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.

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





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