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12 terms

3.1 Nervous System

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central nervous system
the part of the nervous system that consists of the brain and spinal cord
peripheral nervous system
the neurons that connect the central nervous system to the rest of the body, including muscles and glands
neurons
a nerve cell
cell body
a part of the neuron that produces energy needed for the activity of a cell
dendrites
the branch like extensions of a neuron that receive impulses and conduct them toward the cell body
axon
a long-tubelike structure that attached to a neuron that transmits impulses away from the neuron to the cell body
myelin
a white, fatty substances that insulates axons and enables rapid transmission of neural impulses
axon terminals
small fibers branching out from the axon
neurotransmitter
a chemical messenger that carries impulses to the synaptic gaps between neurons
spinal cord
a column of nerves within the spine that transmits messages to and from the brain
somatic nervous system
the division of the peripheral nervous system that connects the central nervous system with the sensory recepetors, muscles, and the skin.
autonomic nervous system
the subdivision of the peripheral nervous system that regulates body functions, such as respiration & digestion.