PSY 324 Chapter Notes - Chapter 13: Benign Tumor, Dura Mater, Metastasis
11 Apr 2020
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Tumor: mass of cells whose growth is uncontrolled and that serves no useful function. Major distinction between malignancy and benignancy is whether rumor is encapsulated: encapsulated: if there"s a distinct border between mass of tumor cells and surrounding tissue. Infiltrating: no clear-cut border between tumor and normal tissue in surrounding. If removed, some cells may be missed, and these will produce new tumor. Tumours damage brain tissue by 2 means: compression, can kill brain tissue by blocking flow of cerebrospinal fluid and causing hydrocephalus. Tumors don"t arise from neurons, bc mature neurons aren"t capable of dividing: they arise from other cells in brain or from metastases somewhere in body. Most serious types of tumors: gliomas: from types of glial cells, usually malignant and fast growing, metastases tumor. Some tumors are sensitive to radiation and can be destroyed by beam focused on them. The second most important category of neurological disorders, following stroke.
