jacksonian seizure

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Related to jacksonian seizure: psychomotor seizure

jack·so·ni·an sei·zure

a motor seizure that initially involves one part of the body and then progressively spreads to other parts of the body on the same side; may become generalized; often originates in or near the contralateral rolandic neocortex.
Synonym(s): jacksonian epilepsy

jacksonian seizure

a series of focal seizures with unilateral clonic movements that start in one group of muscles and spread systematically to adjacent groups, reflecting the march of the epileptic activity through the motor cortex.

Jacksonian seizure

Partial seizure, see there.

jack·so·ni·an sei·zure

, jacksonian epilepsy (jak-sō'nē-ăn sē'zhūr, ep'i-lep-sē)
A seizure originating in or near the rolandic neocortex, which clinically involves one part of the body; seizure spread is accompanied by progressive spread to other parts of the body on the same side; may become generalized.


John Hughlings, English neurologist, 1835-1911.
Jackson law - loss of mental functions due to disease retraces in reverse order its evolutionary development.
Jackson rule - after an epileptic attack, simple and quasiautomatic functions are less affected and more rapidly recovered than the more complex ones.
Jackson sign - during quiet respiration the movement of the paralyzed side of the chest may be greater than that of the opposite side, while in forced respiration the paralyzed side moves less than the other.
jacksonian epilepsy - Synonym(s): jacksonian seizure
jacksonian seizure - a seizure originating in or near the rolandic neocortex which clinically involves one part of the body. Synonym(s): jacksonian epilepsy


1. the sudden attack or recurrence of a disease.
2. a convulsion or attack of epilepsy.

audiogenic seizure
a seizure brought on by sound.
cerebral seizure
an attack of epilepsy.
epileptiform seizure
focal seizure
see partial seizure (below).
generalized seizure
see grand mal seizure (below).
grand mal seizure
one with no localizing signs. After a brief period of restlessness, there is unconsciousness, generalized muscular activity, excessive salivation, chewing activity, opisthotonos, running movements, and often urination and defecation. The most common type of seizure in dogs and cats.
Jacksonian seizure
partial seizure
one restricted to a focus in the brain; signs correspond to the area affected, e.g. motor activity of an isolated area or limb, hallucinations such as fly catching, apparent blindness, behavioral abnormalities, etc. Called also focal seizures.
petit mal seizure
a mild, very brief generalized seizure. See also petit mal.
photogenic seizure
a seizure brought on by light.
psychomotor seizure
motor seizures accompanied by a psychic stage. There are hallucinations, salivation, pupillary dilatation, mastication, fecal and urinary excretion, and wild running. Seen in dogs with lesions in the pyriform lobe or hippocampus and from poisoning with agenized flour (canine hysteria). Called also running fits.
tetanic seizure
see tetany.
seizure threshold
the level of stimulation at which a seizure is precipitated.
tonic seizure
one in which the muscles are rigid.
tonic-clonic seizure
alternating tonic (rigid muscles) and clonic (jerking of muscles) phases; a grand mal seizure.