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16 Cards in this Set

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