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| composed of 100 million neurons and is part of the CNS that extends from the brain |
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| three protective, connective tissue coverings that encircle the spinal cord and the brain |
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| superficial,thick, strong layer composed of dense irregular connective tissue. aka as "tough mother" |
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| middle,thin avascular layer composed of loosely arranged collagen and elastic fibers. |
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| innermost layer of thin, transparent connective tissue that adheres to the surface of the brain and spinal cord |
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| inflammation of the meninges |
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| flows between the arachnoid and the pia mater |
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| contain only sensory neurons; conduct nerve impulses fromthe skin, muscles, and internal organs to the CNS |
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| contains only motor neurons which conduct impulses from the CNS to the muscles and glands |
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| gray matter on each side of the spinal cord |
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| contain cell bodies and axons of interneurons and axons of axons of incoming sensory neurons |
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| contain somatic motor nuclei, which are clusters of cell bodies of somatic motor neurons that provide nerve impulses for contraction of skeletal muscles |
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| contain autonomic motor nuclei, which are clusters of cell bodies of autonomic motor neurons that regulate the activity of cardiac muscle, smooth muscle, and glands. |
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| innermost layer that wrap individual axons within a nerve .comprised of collagen fibers, fibroblasts and macrophages |
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| middle layer that is a thick layer of connective tissue made up of 15 layers of fibroblasts |
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| outermost layer covering the entire nerve made up of fibroblasts and thick collagen fibers |
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| fast, involuntary, unplanned sequence of actions that occurs in response to a particular stimulus |
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| the pathway followed by nerve impulses that produce a reflex |
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| sensory nerve impulse enters the spinal cord on the same side from which the motor nerve impulses leave it |
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| small degree of contraction present while the muscle is at rest |
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