PSY290H5 Chapter Notes - Chapter 10: Vestibulocochlear Nerve, Neuroma, Neuroplasticity
Document Summary
Influence function of the brain only by the pressure they exert on surrounding tissue. Almost always benign; are surgically removable with little risk of further growth: infiltrating tumors: grow diffusely through surrounding tissue. Malignant tumors: difficult to remove or destroy completely; cancerous tissue that remains after surgery continues to grow. Gliomas: brain tumors develops from glial cells; infiltrating, rapid growth, common. Cerebral hemorrhage: bleeding in the brain; occurs when cerebral blood vessel ruptures. Aneurysm: balloon-like dilation in the wall of an artery where elasticity is defective. Other causes: congenital (at birth) aneurysms, result from exposure to vascular poisons, infection. Avoid high blood pressure or strenuous activity. Two important properties: takes a while to develop; neural loss can often be detected a day or two later, does not occur equally in all parts of the brain, susceptible neurons in hippocampus. When the blood vessel becomes blocked, many blood- deprived neurons become overactive and release excessive quantities of glutamate, which overactivates.
