- Continuous involuntary quivering or rippling of muscles at rest, caused by spontaneous, repetitive firing of groups of motor unit potentials. SYN: fibrillary chorea, Morvan chorea. [myo- + G. kyma, wave]- facial m. m. that appears in the facial muscles, causing narrowing of the palpebral fissure and continuous undulation of the facial skin surface; the latter is referred to as “bag of worms” appearance and is best seen with reflected light; due to intrinsic brainstem lesion, such as a pontine glioma or multiple sclerosis.- generalized m. widespread m., present in multiple limbs and often the face; of various causes, including Isaac syndrome, uremia, thyrotoxicosis and gold toxicity (gold-m. syndrome).- hereditary m. [MIM*160100] a syndrome consisting of muscle contractions and night cramps; autosomal dominant inheritance.- limb m. m. present in one or more limbs; various causes, one of the more common being prior plexus radiation.
* * *n.prominent quivering of a few muscle fibres, not associated with any other abnormal features. It is a benign condition. See also fasciculation.
* * *myo·kym·ia (mi″o-kiґme-ə) [myo- + Gr. kyma wave] a benign condition marked by brief spontaneous tetanic contractions of motor units or groups of muscle fibers, usually adjacent groups of fibers contracting alternately. Called also myoclonia fibrillaris multiplex.
Medical dictionary. 2011.