Nervous System Essay

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Chapter 8 The Nervous System 1. Terms 1. Encephalitis—The inflammation of the brain or spinal coed tissue largely caused by a virus that enters the CNS when the person experiences a viral disease such as measles or mumps or through the bite of a mosquito or tick. 2. Hydrocephalus—An abnormal increase of cerebrospinal fluid in the brain that causes the ventricles of the brain to dialate, resulting in an increased head circumference in the infant with open fontanel(s); a congenital disorder. 3. Neuralgia—Severe, sharp spasmlike pain tht extends along the course of one or more nerves. 4. Narcolepsy—Uncontrolled, sudden attacks of sleep. 5. Dysphagia—difficult speech. 2. Pathologial Conditions 1. Anencephaly—An absence of the brain and spinal cord at birth, a congenital disorder. 2. Bell’s palsy—A temporary or permanent unilateral weakness or paralysis of the muscles in the face following trauma to the face, and unknown infection, or a tumor pressing on the facial nerve rendering it paralyzed. 3. Carpal tunnel syndrome—A pinching or compression of the median nerve within the carpal tunnel due to inflammation and swelling of the tendons, causing intermittent or continuous pain that is greatest at night. 4. Cerebral concussion—A brief interruption of brain function, usually with a loss of consciousness lasting for a few hours. 5. Cerebral contusion--a small, scattered venous hemorrhage in the brain (or better described as a “bruise” of the brain tissue) occurring when the brain strikes the inner skull. 6. Cerebrovascular accident (CVA)—involves death of a specific portion of brain tissue, resulting from a decrease in blood flow (ischemia) to that areas of the brain; also called a stroke. 7. Epilepsy—a syndrome of recurring episodes of excessive irregular electrical activity of the brain resulting in involuntary

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