PSYC 362 Chapter Notes - Chapter 14: Partial Seizure, Cancer, Absence Seizure
14 Aug 2016
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Document Summary
Tumor: a mass of cells whose growth is uncontrolled and that serves no useful function: malignant tumor: a cancerous (literally, harm-producing ) tumor; lacks a distinct border and may metasize. Tumors damage brain tissue by two means: compression and infiltration. Any tumor growing in the brain, malignant or benign, can produce neurological symptoms and threaten the patient"s life. Even a benign tumor occupies space and thus pushes against the brain. Even worse, are malignant tumors which cause both compression and infiltration. As a malignant tumor grows, it invades the surrounding region and destroys cells in its path. Malignant gliomas contain tumor-initiating cells, which originate from transformations of neural stem cells. These cells rapidly proliferate and give rise to a glioma. Meningioma: an encapsulated, benign tumor consisting of cells that constitute the dura mater membrane. Such tumors tend to originate in the part of the dura mater that found between the two cerebral hemispheres.
