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16 Cards in this Set
- Front
- Back
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action potential
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the sequence of electrical changes that occurs in a portion of the nerve cell membrane that is exposed to a stimulus that exceeds the membrane's threshold
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autonomic nervous system
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portion of the nervous system that controls the viscera
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axon
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a nerve fiber. it conducts nerve impulses away from the nueron cell body
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central nervous system (CNS)
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the brain and the spinal chord
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convergeance
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nerve impulses arriving at the same nueron
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dendrite
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process of a nueron that receives input from other nuerons
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divergence
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spreading apart
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effector
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a muscle or gland that effects changes in the body
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facillation
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subthreshold stimulation of a nueron that increases responsiveness to further stimulation
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ganglion
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a mass of nueron cell bodies, usually outside the central nervous system
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myelin
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fatty material that forms a sheathlike covering around some axons
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nuerilemma
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sheath formed from Schwann cells on the outside of some axons
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nuerotransmitter
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chemical that an axon end secretes on an effector(muscle or gland)or another nueron
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reflex arc
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a nerve pathway, consisting of a sensory nueron, internueron, and motor nueron that forms the structural and functional bases for a reflex
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peripheral nervous system (PNS)
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the portion of the nervous system outside the central nervous system
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sensory nueron
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a nueron that transmits an impulse from a receptor to the central nervous system
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