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36 Cards in this Set
- Front
- Back
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Visceral Motor System
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another name for the Autonomic nervous system
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automatic and involuntary functions
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What does the ANS control
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Parasympathetic and Sympathetic Divisions
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what two divisions is the ANS comprised of
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maintains homeostasis
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what does the parasympathetic division do
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prepares for stressful situations (fight or flight)
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what does the sympathetic division do
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Cardiac muscle, smooth muscle, and Glands both endocrine and exocrine
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motor neurons in the ANS innervate what type of structures
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organized in a two neuron chain between the CNS and the effector (target) organ
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how are motor neurons organized in this system
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preganglionic neuron and it is found in the CNS
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What is the name of the first motor neuron and where is it found
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Postganglionic neuron and it is found in a ganglion in the PNS
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What is the name of the second motor neuron and where is it found
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in the spinal cord levels T1-L2
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where does the sympathetic division (thoracolumbar outflow) originate
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intermediolateral cell column (IML)
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where are the preganglionic nerve cell bodies located
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vental spinal nerve roots to enter spinal nerves T1-L2
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where do the preganglionic nerve fibers exit the CNS and to do what
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white communicating rami (14 pairs) associated with spinal verves T1-L2
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what structue do the preganglionic nerve fibers pass through and what is this structure associated with
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synapse with post ganglionic neurons at eh same level
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preganglionic nerve fibers enter the sympathetic chain ganglia to
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ascend to a higher level or descend to a lower level to synapse
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preganglionic nerve fibers enter the sympathetic chain ganglia to
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continue on to a collateral ganglion in the abdominal or pelvic cavity before synapsing
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preganglionic nerve fibers enter the sympathetic chain ganglia to
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bilateral structures located adjacent to (parallel) the vertebral column
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what makes up the sympathetic chain ganglia
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extends vertically from the base of the skull to the coccyx
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what does the sym. chain ganglia extend to
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white communicating rami
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how does the symp. chain ganglia (preganglionic) connect to spinal nerves T1-L2 (14)
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gray communicating rami
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how does the symp. chain ganglia (postganglionic) connect to all spinal nerves (31)
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Sensory neuron GVA
Connecting neuron (in spinal cord) 2 motor neurons GVE incuding pre and postganglionic neurons |
what are the components of a Visceral Reflex Arc
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brain stem motor nuclei associated with CN III, VII, XI, X
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where do the preganglionic neurons in the PARAsympathetic division originate from
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4 paprasymp. ganglia that is in conjuction with preganglionic nerve fibers that are distributed to the cranial region
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CN III, VII (two ganglia) IX are associated with what in the parasymp.
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the thoracic and abdominal viscera via the CN X. These fibers synapse in the walls of target organs
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where are the preganglionic nerve fibers also distributed
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contained entirely within the walls of the target organs
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where are short postganglionic nerve fibers contained
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S2-S4
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what spinal cord levels are associated with the sacral portion
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to enter the pelvic splanchic nerves (nervi erigentes)
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why do the preganglionic nerve fibers exit the CNS via ventral spinal nerve roots of S2-S4
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the pelvic viscera and external genitalia
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where are the pelvic splanchic nerves distributed
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short postganglionic neurons
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what do preganglionic fibers synapse with in the wall of the target organs
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walls of target organs
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where are the postganglionic neurons contained entirely
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neurotransmitters
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what are the chemicals released at synapses between pre and postganglionic neurons and between postganglionic neurons and effector organs
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PRE-Acetylcholine
POST- Acetylcholine |
in the parasymp. division what neurotransmitters are assoc. with pre and postganglionic neurons
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PRE- Acetylcholine
Post- Norepinephrine (epinephrine)- chemical used in the drug ADRENALINE |
in the symp. division what neurotransmitters are assoc with pre and postganglionic neurons
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PRE AND POST- acetylcholine
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in the symp. division in the sweat glands what neurotransmitter are assoc with pre and post
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PRE-Acetylcholine
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in the symp. division in the adrenal gland what neurotransmitter is released directly into the blood stream
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releases epinephrine straight into the blood stream. It is an endocrine gland and it is only supplied by 1 neuron which is an exception to the rule
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what is unique about the adrenal gland
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