Term
| peripheral nervous system (PNS) |
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Definition
| The most available part of the nervous system for early anatomists. The part of the nervous system not encased in bone. |
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Term
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Definition
| voluntary nervous system. innervates muscles and material between bones and skin. responsible for all intentional movement and physical sensation. |
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Term
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Definition
| Nerve fibers which move from the muscles to the peripheral nervous system. Conducts sensory information. |
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Term
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Definition
| Motor nerve fibers -- from the nervous system to the rest of the body. |
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Term
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Definition
| Involuntary nervous system. Responsible for sensory and motor activity outside of conscious control (i.e. internal organs, glands, intestinal muscles, etc.). Consists of a sympathetic and parasympathetic subdivision. |
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Term
| sympathetic nervous system |
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Definition
| Fight or flight nervous system. |
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Term
| parasympathetic nervous system |
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Definition
| Rest and recuperation nervous system. |
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Term
| central nervous system (CNS) |
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Definition
| Components of nervous system encased in bone (namely brain and spinal cord). CNS surrounded by three membranes, the dura mater, arachnoid membrane and pia mater. |
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Term
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Definition
| Three membranes which surround the CNS. Isolate brain and protect it from infection and damage. |
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Term
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Definition
| Outermost membrane in the meninges (hard plastic) closest to the skull. |
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Term
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Definition
| spiderweb-like cushioning between outer and inner membrane of the meninges. |
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Term
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Definition
| Innermost membrane of the meninges -- thin, fragile layer closest to the brain/spine. |
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Term
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Definition
| The thin layer of fluid on which the brain and spinal cord rest. |
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Term
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Definition
| Blood vessels within CNS have very tight gap junctions which regulate the material and substances that travel in from the circulatory system. |
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Term
| spinal cord (long definition) |
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Definition
| Conducts afferent and efferent nerve impulses to the brain and peripheral nervous system. Afferent nerve fibers enter through the dorsal region and efferent nerve fibers exit through the abdominal region. Outer regions consist of afferent and efferent fibers whereas the central region consists only of efferent fibers and neurons. |
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Term
| interneurons (and process) |
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Definition
| Control reflex responses; afferent fibers activate interneurons which active motor (efferent) neurons which trigger knee movement before brain receives the sensory signal. |
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Term
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Definition
| Carries CSF, which is a consequence of the embryonic development of the system. |
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