definitions for nervous system
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Nerves
combination of many nerve fibers located at the outside of the brain and spinal cord
neurotransmitters
special chemicals Located at the end of each axon that allows for the nerve impulses to pass from one neuron to another
synapses
Spaces between the axon of one neuron and the dendrites of many other neurons
myelin sheath (what does it do)
Increases rate of impulse transmission Insulates and maintains the axon
neuron or nerve cell
Basic structural unit of the nervous system
nervous system
complex, highly organized system that coordinates all the activities of the body
meninges
membranes or protective lining that covers the brain and spinal cord there are THREE
efferent/motor nerves
Carry messages from the brain and spinal cord to the muscle and glands
afferent/sensory nerves
Carrie messages from all of the parts of the body to the brain and spinal cord
associative or internuncial nerves
Carries both sensory and motor messages
brain
Mass of nerve tissue, well protected by membranes of the cranium or skull
cerebrospinal fluid
circulate continually between the ventricles and through the subarachnoid space Serves as a shock absorber to protect brain and spinal cord
ventricles
Hollow Spaces that connect with each other and with the space under the arachnoid membrane