To see the brain you should hang up with a neurologist. The brain is part of the nervous system, a central nervous system that includes both cerebral hemispheres, the telencephalon, and so on. Cerebrovascular diseases, including cerebral hemorrhage and cerebral infarction, are the most common clinical lesions of the brain. Cerebral hemorrhage usually starts during activity, and cerebral infarction mostly starts in quiet state. Common causes include hypertension, diabetes mellitus, hyperlipidemia, and cerebral atherosclerosis. Patients usually have an acute onset of illness, mostly in middle-aged and elderly people, and can present with a variety of different signs and symptoms, mainly depending on the site of lesion involvement. If it is a cerebral infarction in the basal ganglia region, the patient usually manifests hemiparesis, hemianopsia and hemiplegia, and speech dysfunction can also occur in left-sided lesions. If the lesion is in the cerebral hemispheres, at the same time the patient may also present with disturbances of consciousness, including lethargy, somnolence and coma, mostly with cerebral edema and increased intracranial pressure. If the patient has a lobar lesion, seizures can occur as well as psychiatric symptoms. In case of trauma and tumor neurosurgery is recommended!