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42 Cards in this Set
- Front
- Back
A ________ is a collection of nerve cell bodies within the CNS.
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nucleus
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A ________ is a collection of nerve cell bodies within the PNS.
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ganglia
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_________ ganglia DO NOT have a synapse.
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Dorsal root
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________ ganglia are visceral motor and do have a synapse.
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Autonomic
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Where do spinal nerves 'mix' (to become both sensory & motor)?
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In the nerve then rami. The ROOTS are where they are separated
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Cell bodies of SYMPATHETIC nerve cells are located in the __________.
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lateral horn; the axon then exits the ventral root
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All sympathetic fibers pass through the _______ chain where where (sometimes) ______ occurs immediately.
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sympathetic;
synapse |
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THe motor aspect of the nervous system can be divided into ________ & ________.
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somatic;
autonomic |
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Somatic Nervous System:
Target Organ:________ Neuron(s) involved:_______ Origin of Neuron:_________ |
skeletal muscle;
one; spinal cord, specifically anterior horn cells |
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Autonomic Nervous System:
Target Organ:________ Neuron(s) involved:_______ Origin of Neuron:_________ |
smooth muscle, cardiac muscle, glands;
2; CNS |
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Sensory fibers running with the ANS ____ (are or aren't) part of the ANS.
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aren't
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ANS is voluntary (T/F).
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false
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The ANS is defined as ____________, or efferent.
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visceromotor
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The 2 divisions of the ANS are ________ &________.
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sympathetic & parasympathetic
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THe ________N.S. is voluntary, while the _________N.S. is involuntary.
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SOMATIC:
AUTONOMIC |
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THe parasympathetic N.S. arises ________ (where).
(what specific numbers) |
from spinal cord (specifically S2-S4) & brainstem (CN 3, 7, 9, 10).
It runs alongside (para) the sympathetic n.s. |
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THe _______ N.S. has LONG PRESYNAPTIC ganglia (and therefore short postsynaptic).
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PARASYMPATHETIC
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The_______ N.S. has SHORT PRESYNAPTIC ganglia (and therefore long postsynaptic).
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SYMPATHETIC
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The parasympathetic N.S. is known for _________outflow (from the brainstem or sacral portion of cord)
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craniosacral
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CN ____ is the vagus nerve.
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ten (it is part of the Parasympathetic (autonomic)nervous system.
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The parasympathetic fibers extend to internal organs, or ________, NOT to the _________.
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viscera;
periphery |
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The parasympathetic nervous fibers synapse in ganglia _____ (where).
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in or near target organ.
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Parasympathetic fibers tend to lead to _______ smooth muscle.
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nonvascular
i.e. smooth muscle in gut, tubes (bile duct), and bags not filled with blood. |
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The vagus nerve goes from neck to _________.
Vagus = |
left colic flexure
"to wander" |
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sacral nerves (__-__) that are part of the parasympath. N.S. extend from ____ to ____.
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S2-4;
left colic flexure and pelvic organs. |
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THe sympathetic N.S. targets ___________.
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glands, cardiac muscle, & smooth muscle
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The sympathetic nerve fibers are located in the ______ of spinal cord segments _____ -_____.
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Intermedial lateral cell column;
T1-L2 |
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Sympathetic axons preceed out of _____ and form a component of the _____root.
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intermedial lateral cell column;
ventral |
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Once sympathetic fibers leave the ventral root, they _______.
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lead to spinal nerve then leave via dorsal or ventral rami. Thy synapse, then the postganglionic fibers proceed to target organs
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The sympathetic N.S. is known for _________outflow
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thorocolumbar
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How do sympathetic fibers enter body wall & limbs?
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spinal nerves: leave cord, synapse immediately in chain, connect with grey ramus to spinal nerve;
OR go up or down the chain and then synapse |
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Sympathetic nerves _____ (dilate or constrict) vessels, and ______ glands.
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constrict;
supply |
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Where are sympathetic fibers located on the body?
how? |
EVERYWHERE.
hitching a ride with every spinal nerve (which cover every sq. inch of the body. |
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Target organs, or ________, for sympathetic nerve fibers are found in the ________.
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effectors;
ventral body wall or limbs |
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Every presynaptic sympathetic fiber enters the _______.
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sympathetic chain
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THe 2 options for sympathetic nervs leaving for the viscera (not periphery): ____ & ______.
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LEave CNS, synapse in chain, go to target organ;
leave CNS, no synapse, pass through diaphragm, go to prevertebral ganglion & synapse there, then t.o. (thoracic or abdominopelvic) |
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Prevertebral ganglion = ___________ ganglion.
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preaortic
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splanchnic = _________
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visceral
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sympathetic innervaton of thoracic viscera: __________
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cell body exits spinal cord, ventral root, spinal nerve, sympathetic trunk via white comm. rami, SYNAPSES (PARAvertebral), extends to heart & lungs.
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Thoracic (cardiopulmonary) splanchnic nerves extend to the _________.
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heart and lungs
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some thoracic sympathetic fibers reach _______ before synapsing.
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cervical region (heart embryologically formed in cervical region)
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sympathetic innervaton to abdominopelvic viscera: __________
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fibers leave thoracic portion of cord, NO SYNAPSE, synapse in prevertebral ganglion, then to target organ.
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