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47 Cards in this Set
- Front
- Back
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What is part of the CNS?
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the brain and spinal cord
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What is part of the PNS?
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nevrves that lie outide CNS
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Thin cytoplasmic processes- receive stimuli
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dendrites
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single elongate process transmits an impluse down its length
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axon
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at end of axon contains a neurotransmitter
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axon knobs
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What is part of the CNS?
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the brain and spinal cord
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What is part of the PNS?
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nevrves that lie outide CNS
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Thin cytoplasmic processes- receive stimuli
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dendrites
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single elongate process transmits an impluse down its length
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axon
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at end of axon contains a neurotransmitter
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axon knobs
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surrounding a PNS axon are many ______ cells
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schwann
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fuctions of the myelin sheath are?
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1. insulates the axon, preventing impulses from stimulating other axons
2. speeds impulse 3. guides axonal regeneration of peripheral nerves |
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In CNS cells called ____ form the myelin sheath
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oligondendrocytes
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a small gap at the junction of each exon knob and another neuron or muscle cell
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synapse
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CA++ cause the relases of .....
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acetylcholine
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transmit impulses from sense organs to CNS
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sensory neurons
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carry impulses from CNS to skeletal muscles
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motor neurons
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antonomic division 2 sets of nerves that send impulses from CNS to digestive, circulatory, urogenital and endocrine organs
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antonomic division
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extend from CNS into sympathetic chain ganglia to organs.
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sympathetic nerves
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what is the result of sympathetic stimulation?
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-increases heart rate
-increases respiration rate -decreases digestive activity |
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from brain stem and end of spinal cord to organs
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parasympathetic nerves
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a nerve from brain to heart, lungs, kidney, and digestive organs
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vagus nerve
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What is the result of parsympathetic stimulation?
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-decreases heart rate
-reduces blood pressure -decreases inrespiration rate -stimulation at time of rest |
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axons of sensory and motor neurons
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white matter
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cell bodies and dendrites of neurons
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gray matter
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This surrounds the brain externally and internally to cushion the brain
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CSF
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protective layers that surround the brain
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meninges
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CSF is produced by ....
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blood filtration from capillaries
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whats the largest part of the brain?
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cerebrum
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the outer convoluted region is the .......
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cerebral cortex
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covultions are the.....
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gyri
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the furrows are the .....
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sulci
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Located between the cerebral cortex and thalamus
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limbic system
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nerve tracts that interconnect right and left cerebral hemispheres
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corpus callosum
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relay center that lies below corpus callosum
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thalamus
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controls homeostasis. Hunger and thirst center
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hypothalamus
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crossing of optic nerves
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optic chiasma
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relay center for visual and auditory information and head movements
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corpora quadrigemina
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conrols cerebrum contol of equilibrium, posture and coordinates movement of skeletal muscles
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cerebellum
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relay center-connects spinal cord with higher brain centers
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pons
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conrols involunatary activites
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medulla oblongata
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sensory from nasal cavities to brain
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olfactory
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sensory from eyes to brain
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optic
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motor from brain to eye muscles
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oculomotor
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mixed; sensory from taste buds to brain and motor from brain to jaw muscles.
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trigeminal
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degeneration of the myelin sheaths around nerves in the CNS
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multipole sclerosis
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a virus that destroys motor neurons in the spina cord
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polio
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