Focal motor seizure. A focal motor seizure may be shaking or a muscle twitch in the face or the arm caused by involuntary electrical activity in the brain. With this seizure, there is no loss of consciousness. Another name for this is a simple partial seizure. It must occur on one side only.
See below: A simple partial seizure with localized motor activity. There may be spasm or clonus (jerking) of one muscle or a muscle group and this may remain localized or it may subsequently spread to adjacent muscles as a jacksonian seizure. Those w/simple focal seizures do not lose consciousness. They will be aware of and remember the events that occur at the time. Complex partial seizures may not.
See below: A simple partial seizure with localized motor activity. There may be spasm or clonus (jerking) of one muscle or a muscle group and this may remain localized or it may subsequently spread to adjacent muscles as a jacksonian seizure.
Localized jerking. A seizure which causes movement of face, arm or leg, associated with a restricted abnormal electrical discharge in the brain. Sometimes, if prolonged, it may spread and become a generalized seizure.
Yes. It can be even more serious if the affected brain area extends further and involves more functional capacity. One would need to investigate why any seizures are happening at all -- to be sure there are no masses or vascular issues causing them, etc. Level of consciousness during seizures is important, as some "partial" seizures can become "complex", and would then include loss of consciousness.
Very likely. A focal motor seizure is a type of convulsion.
Yes. A true focal motor seizure is a sign of a local irritable brain lesion, which could be an area of trauma, bleeding, infarction, tumor, infection. Often these focal problems generalize and cause a full blown grand mal seizure. If you are experiencing such spells, start an anti-epileptic medication.
Yes. A focal motor seizure is potentially serious, since it means there is a localized area of brain that is resonsible. It requires an evaluation with neuroimaging to evaluate for structural abnormalities, tumors, blood vessel malformations or bleeding within the brain.
FOCAL LESIONS CAN. Result is specific epileptic discharges that start at site of lesion and spread. A focal seizure by definition does not generalize and thus, may not lose awareness. There may be rhythmical shaking of a hand, moving up the arm, and perhaps involving face and/or leg, and stopping after 1-2 minutes. Can be termed "jacksonian march". Classically associated with focal tumors, but not always.
Motor strip frontal. The brain has specific regions that control specific parts of the body. The motor strip of the frontal lobe has foot and leg at top and hand and face down the side. Very useful areas (mouth and hand) have huge area while less useful have less. Involved neurons can seize and produce abnormal twitching just in the specific part of the body they represent. This causes a focal motor seizure.