| myoclonus | Twitching or spasm of a muscle or a group of muscles. (27 Sep 1997) |
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| myoclonus epilepsy | A clinically diverse group of epilepsy syndromes, some benign, some progressive. Many are hereditary with mendelian and nonmendelian mitochondrial inheritance. All are characterised by the occurrence of myoclonus, which may be limited or predominate in the condition. Specific syndromes include cherry red spot myoclonus syndrome, ceroid lipofuscinosis, myoclonic epilepsy with ragged red fibres, and Baltic myoclonus. Synonym: localization related epilepsy. (05 Mar 2000) |
| myoclonus multiplex | An ill-defined disorder marked by rapid and widespread muscle contractions. Synonym: paramyoclonus multiplex, polyclonia, polymyoclonus. (05 Mar 2000) |
| Baltic myoclonus disease | One of the familial light sensitive myoclonic epilepsies. Unlike Lafora body polymyoclonus, where inclusion bodies are seen in the brain cells, the prognosis is often favourable. Probably an autosomal recessive disorder. (05 Mar 2000) |
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| palatal myoclonus | Rhythmic contractions of the soft palate, the facial muscles, and the diaphragm, related to lesions of the olivocerebellar pathways. See: palatal nystagmus. (05 Mar 2000) |
| cherry-red spot myoclonus syndrome | <syndrome> A neuronal storage disorder in children characterised by a cherry red spot at the macula, progressive myoclonus, and easily controlled seizures; the result of sialidase deficiency. Type 1 is characterised by normal body habitus, cherry red macula, myoclonus, and normal beta-galactosidase levels; type 2 by short stature, bony abnormalities, and deficient beta-galactosidase. Synonym: sialidosis. (05 Mar 2000) |
| stimulus sensitive myoclonus | Myoclonus induced by a variety of stimuli, e.g., talking, calculation, loud noises, tapping, etc. (05 Mar 2000) |
| nocturnal myoclonus | Frequently repeated muscular jerks occurring at the moment of dropping off to sleep. (05 Mar 2000) |