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Chapter 14

PSYB65 - Chapter 14 - Sep 20-Oct 4, 2010

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University of Toronto Scarborough
Ted Petit

Chapter 14 Human Brain Damage Module 14.1: Causes of Brain Damage Tumors (Neoplasms) - Tumor: mass of new and abnormal tissue that is not physiologically beneficial to its surrounding structure. Describe tumors as space-occupying lesions (= they are foreign objects that cause damage to the central nervous system (CNS) by putting pressure on it and occupying space that is normally occupied by the CNS. Differ from one another (what type of cell give rise to tumor, how rapidly they grow, whether they infiltrate and destroy the surrounding neural tissue or remain relatively encapsulated, and how likely they are to recur if they are removed) - 4 major types of brain tumors: those that originate from glial cells, the meninges, nervous tissue, or other parts of the body already infected with a tumor Tumors arising from glial cells (most common type) - Gliomas - tumors that arise from glial cells Astrocytomas Glioblastoma Medulloblastoma (arise from the growth of (also called a primitive astrocytes) neuroectodermal tumor) Major type Major type Less common Tend not to grow very quickly Grow quickly Are rarely malignant Highly malignant Highly malignant infiltrating tumor - Some astrocytomas are - Tend to infiltrate the - Tend to form around the relatively well surrounding tissues, cerebellum and brainstem encapsulated, so the making them very difficult early in life damage that they cause to excise surgically - Prognosis for individuals tends to come from without the removal of the who develop compression of the relatively healthy Medulloblastoma tends to surrounding tissues surrounding neural tissue be relatively poor - Slow-growing benign tumors can be extremely dangerous if they start to grow in relatively inaccessible locations. When surgical treatment is not Chemotherapy Chemotherapy practical, Chemotherapy is typically used Tumors arising from the Meninges - Meningiomas tumors that grow out of (and remain attacched to) the meninges Because they grow out of tissues found outside of the CNS, meningiomas tend to be reasonably well encapsulated. source.doc 1 www.notesolution.com
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