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Neural Basis of Behavior: Ch 15

12 Pages

Course Code
PSYC 3250
Pauline Charlton

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Ch 15 neurological disordersTumorsTumor mass of cells that grow uncontrollably and serves no useful function can be malignant cancerous or benign harmless Malignant tumors can become infiltrated into other healthy cells and when a surgeon cuts it away some cells maybe missed causing a new tumor to be created Malignant tumors can also become metastasesthese cancerous cells can travel through the bloodstream and capillaries and can grow tumors in other regions of the bodyTumors damage brain tissue two ways 1 they compress the brain tissue and can block the flow of CSF can happen with benign tumors 2 malignant tumors can compress and infiltrate which destroys healthy brain cells Since nerve cells cannot divide tumors do not arise from them however they can arise from glia cells which is known as gliomas which are both malignant and fast growing Once a surgeon has removed most of the tumor radiation can be used to destroy the rest as tumors are normally sensitive to radiation Meningioma a benign tumor consisting of cells found in the dura mater and arachnid membrane See table 151 on pg 522 for other types of tumorsSeizure disordersndFollowing strokes seizure disorders are the 2 most important category of neurological disorders Seizure period of sudden extensive activity of cerebral neurons Convulsions when neurons of the motor system are involved in a seizure wild uncontrollable activity of the muscles is displayedPartial seizure have a definite focus restricted to a small part of the brain either in a scarred region caused by an injury or a developmental abnormality Simple partial seizure cause changes in consciousness but do not cause a loss of consciousnessbased on their location and severity these seizure show Complex partial seizurea loss in consciousness Generalized seizures widespread and involve most of the brain can either grow from a focus or their origin may not be discovered at times Grand mal most severe form of seizures is generalized and also includes convulsions Aura takes place seconds before a grand mal which causes excitation of neurons in the surrounding seizure focus Tonic phase beginning stage of a grand mal where the patients muscles contract forcefullypatient is completely unconscious by nowClonic phase 15 sec after the tonic phase the muscles tremble and start convulsing starts off fast and then eventually slows down the eyes may roll and the autonomic system causes sweating and salivation 30 seconds after the person relax and go into an unresponsive sleep for around 15 mins they may wake up after this but will most likely go back to sleep for another few hours Partial seizures are less dramatic as they include motor changes sensory changes or both simple partial seizures can eventually become more severe with every seizure that occurs and can change from being a simple partial seizure to a complex one
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