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17 Cards in this Set
- Front
- Back
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Peripheral Nervous system
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nerves connecting the brain and the spinal cord to other parts of the body
consists of cranial and spinal nerves |
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Cranial Nerves
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-12 pairs that are attached to the undersurface of the brain
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Spinal Nerves
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-31 pairs attached to the spinal cord
-8 cervicl 12 thoracic 5 lumbar 5 crospinal 1 coccygeal -after exiting the spinal cord they branch and form PN of the trunk and limbs |
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Plexus
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network of intersecting "braided" branches
when several spinal nerves form a single peripheral nerve |
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Autonomic nervous system
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regulate the bodies automatic involuntary functions that maintain and restore homeostasis
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Somatic Nervous System
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motor nerves that control the voluntary actions of skeletal muscles
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Autonomic neurons
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motor neurons that make up the ANS
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Ganglia
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"junction box" where dedrites and cell bodies (in gray matter) axons extend from the spinal cord and brain stem
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Preganglionic neurons
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autonmic neurons that conduct impulses between the spinal cord and a ganglion
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Postganglionic neurons
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conduct imulses from a ganglion to cardiac muscle, smooth muscle, or glandular epihelial tissue
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Visceral effectors
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tissues which autonomic neurons conduct impulses
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Sympathetic and Parasympathetic
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divisions of the ANS
also referred to as thoracolumbar system (SYM) craniosacral system (PAR) |
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sympathetic preganglionic neurons
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have dendrites in the gray matter of the thoracic and upper lumbar segments
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sympathetic postganglionic neurons
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dendrites and cell bodies in sympathetic ganglia, which is located in front of and on each side of the spinal column
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Sympathetic control
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Acclerates HB
constricts/dilates BV relaxes bladder closes sphincter dilates pupils goose bumps increases adrenalin/sweating |
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Parasympathetic control
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slows HB
increases peristalsis contracts bladder opens sphincter increases digestive juices contracts pupils |
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Adrenergic fibers
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releases the neurotransmitter norepinephrine.
-is the axon of a sympathetic postganglion neuron |
