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| peripheral nervous system |
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| peripheral nervous system |
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| the nerves that extend to the peripheral parts of the body |
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| consists of the structures that regulate the body's involuntary funtions |
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| the processes or projections that transmit impulses to the neuron cell bodies or axons |
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| cell body, dendrite and axon |
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| the processes that transmit impulses away from the cell bodies or dendrites |
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| transmit impulses to the spinal cord and brain from all parts of the body. aka afferent neurons |
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| transmit impulses away from the spinal cord and brain. aka efferent neurons |
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| conduct impulses from sensory neurons to motor neurons. aka central or connection neurons |
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| a white, fatty substance formed by Schwann cells that wrap round some axons outside the CNS |
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| indentations between adjacent Schwann cells |
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| the outter cell membrane of a Schwann cell |
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| a common type of brain cancer |
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| relatively large glia cells that look somewhat starlike because of thereadlike extentions that jut out from their surfaces |
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| ususally stationary but in inflammed or degenating brain tissue they enlarge and move about eating microbes like scavangers |
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| help hold nerve fibers together and produce fatty myelin sheath that envelops nerve fibers in the brain |
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| charaterized by myelin loss and destruction accompanied by varying degrees of oligodendrocyte injury |
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| general name for tumors arising in nervous system structures |
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| Multiple Neurofibromatosis |
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| an inherited disease characterized by numerous fibrous neuromas throughout the body |
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| a group of peripheral nerve fibers bundled together |
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| bundles of axons in the CNS |
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| myelinated axons in form this area of the brain |
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| brain and cord tissue composed of cell bodies and unmyelinated axons and dendrites |
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| the thin wrapping of fibrous connective tissue that surrounds each axon in a nerve |
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| groups of axons that are each wrapped in endonerium |
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the thin fibrous membrane that surrounds each fascicle
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| a tough, fibrous sheath that covers the whole nerve |
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| a neuron pathway important to nevous functioning |
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| a group of nerve-cell bodies located in the PNS |
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| the beginnings of dendrites of sensory neurons |
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| a microscopic space that separates the axon ending of one neuron and the dendrite ending of another |
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| the respose to impulse conduction over the reflex arc |
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| type of impulse travel that is much faster than possible in nonmyelinated sections |
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| presynaptic and postsynaptic neurons |
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| the two ends that transmit impulses across the synapse. presynaptic sends and postsynaptic recieves |
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| a tiny bulge at the end of a terminal branch of a presynaptic neuron's axon |
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| chemicals by which neurons communicate |
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| substance released at some of the synapses of the spinal cord and neuromuscular junctions |
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| norepinephrine dopamine and seritonin all belong to this group which may aide in sleep, motor function mood and pleasure |
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| endorphins and enkephalins |
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| these neurotransmitters inhibit conduction of pain impulses. Are natural pain killers |
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| a chronic nervous disorder resulting from a defincincy of the neurotransmitter dopamine in certain parts of the brain. |
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| an enlarged, upward extension of the spinal cord. |
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| second largest part of the brain, functions in normal movement |
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| a small but important part of the brain that has 2 main structures: the thalamus and hypothalamus |
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| located below the thalamus, functions include regulation of temp, water balance, hunger, sex drive, pain, and fear |
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| helps produce sensations and associates with emotions |
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| the largest and uppermost part of the brain |
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