Focal motor seizure Focal myoclonic seizure 2011-10-18T02:34:14Z Local myoclonic seizures Localized myoclonic seizure Partial myoclonic seizures HP:0025191 UMLS:C4023501 Segmental myoclonic seizure Partial myoclonic seizure HP:0011166 Segmental myoclonic seizures Localised myoclonic seizure A type of focal motor seizure characterized by sudden, brief (<100 ms) involuntary single or multiple contraction(s) of muscles(s) or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus. Focal myoclonic seizures Myoclonic seizure