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31 Cards in this Set
- Front
- Back
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neuron |
principal cell of nervous tissue -irratibility, conductivity, and transmission |
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nervous tissue |
impulse conducting system of the body |
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efferent neurons |
neurons that conduct messages away from the central nervous system |
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afferent neurons |
neurons that conduct messages to the central nervous system |
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synapse |
junction between two neurons |
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perikaryon |
cell body of neuron |
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Nissl substance |
rough ER of the neuron |
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neurofibrils |
microfilaments of neurons |
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dendrites |
short branched processes on neurons main receptive surface nerve impulses are directed towards the cell body |
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axon |
single long neuron process with branches on the end -conducts impulses away from the cell body -aka nerve fiber
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Schwann cell |
forms insulation to the axons that supply the skeletal muscle adjoin at nodes of Ranvier more nodes= faster impule travel |
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myelin |
insulation for axons formed by Schwann cells in the peripheral nervous system
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unmyelinated nerve fibers |
multiple small fibers surrounded by Schwann cells but without myelin sensory receptors |
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multipolar neuron |
neuron with multiple dendrites and one axon most common |
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bipolar neuron |
neuron with one dendrite and one axon hearing, smell, vision, taste |
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pseudounipolar neuron |
neuron with a single process that splits into peripheral receptor and a central process sensory only |
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epineurium |
C.T. covering a whole nerve |
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nerve fascicle |
small bundles of nerve fibers within a nerve |
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perineurium |
C.T. subdividing a nerve into fascicles |
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endoneurium |
C.T. surrounding each nerve fiber |
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axon |
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bipolar neuron |
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dendrites |
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endoneurium |
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epineurium |
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myelinated axon |
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multipolar neuron |
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nerve fascicle |
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neuron cell body green-nucleus red-Nissl substance |
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perineurium |
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pseudounipolar neuron |
