Myoclonus
true
UMLS:C0027066
UMLS:C1854302
myoclonic contraction
Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.
HP:0007087
myoclonic jerk
Jerking
SNOMEDCT_US:127324008
MSH:D009207
HP:0001336
human_phenotype
SNOMEDCT_US:17450006
Myoclonus may be synchronous (several muscle contracting simultaneously), spreading (several muscles contracting in sequence), or asynchronous (several muscles contracting with varying and unpredictable relative timing). Myoclonus is characterized by sudden unidirectional movement due to muscle contraction (positive myoclonus) or due to sudden brief muscle relaxation (negative myoclonus).
Myoclonic jerks
Involuntary jerking movements
HP:0002535
Involuntary movements