Focal clonic seizure true true UMLS:C0752323 Localised clonic seizure Partial clonic seizure A focal clonic seizure is a type of focal motor seizure characterized by sustained rhythmic jerking, that is regularly repetitive. Focal clonic seizures The movement involves sustained rhythmic jerking, this may involve a limb, half the face or one side of the body, and may spread according to a Jacksonian march: The jerking may spread to involve parts of the body according to their representation on the motor cortex (according to the homunculus). Localized clonic seizure The movement involves sustained rhythmic jerking, this may involve a distal limb, one limb or one side of the body. The jerking may spread to involve parts of the body according to their representation on the motor cortex (according to the homunculus), this is known as a Jacksonian march. Segmental clonic seizure HP:0002266 MSH:D020938 http://www.medlink.com/article/focal_clonic_seizures human_phenotype Focal motor seizure