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Download Chapter 8.4: Nervous System
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3 layers of protective membranes Around brain and spinal cord Shock absorption Dura mater Outermost layer Holds brain in place Contains epidural space Anesthetic causes temporary paralysis Inflammation of the meninges Due to bacteria or viruses Disrupt blood flow Kills neurons and glial cells Central canal Filled with cerebrospinal fluid 31 segments 1 dorsal root ganglia/segment Contains sensory neurons Connect spinal cord to muscles and glands Extend only to lumbar vertebrae Gray matter—cell bodies of neurons and glial cells White matter—axons
