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15 Cards in this Set
- Front
- Back
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What are neuroglia or glial cells?
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a group of cells that structurally and functionally support and protect the nervous system
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soma
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central cell body
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dendrites
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receive stimuli or impulses
short, multibranched |
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axon
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sends stimuli or signals, long and covered with myelin
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myelin
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fatty substance surrounding axons, appears white
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oligondendrocytes
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the cell membrane of the myelin sheath composed of specialized glial cells in the brain and spinal chord
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Schwann cells
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cell membrane myelin sheath composed of glial cells in the nerves outside of the brain and spinal chord.
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Nodes of Ranvier
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gaps in the myelin sheath that enhance the speed of conduction
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afferent nerves
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conduct nervous impulses towards the CNS. Sensory
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efferent nerves
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conduct nervous impulses away from the CNS. Motor
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somatic nervous system
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conscious or voluntary control of skeletal muscles
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autonomic nervous system
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controls with out thought, BP HR. Receive afferent sensory impulses to regulate body fx.
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resting state
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when a neuron is not being stimulated.
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sodium-potassium pump
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active transport molecule that moves sodium molecules out of the neuron and potassium molecules into the neuron to maintain resting state. cell is polarized, more negative on the inside
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resting membrane potential
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net negative charge of a neuron.
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