Myoclonus is:

A. Severe and painful muscle spasms
B. Quick twitches of a single motor unit
C. Brief involuntary contractions of a muscle or group of muscles
D. Persistent muscle twitching after spinal or cerebral shock
E. None of the above


ANS: C
Rationale: Myoclonus is brief, involuntary contractions of a muscle or group of muscles. Examples are hiccups and the muscle jerks that some people experience when falling asleep. Myoclonus is not painful, affects the entire muscle, and is not characteristic after spinal or cerebral shock.

Health & Biomechanics

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