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Autonomic NS (Pathways (Sympathetic (first neuron in spinal cord…
Autonomic NS
Pathways
Sympathetic
first neuron in spinal cord
preganglionic fiber is
SHORT
neurotransmitter:
ACh
Nicotinic receptor
second neuron in
paravertebral
ganglia OR
prevertebral
ganglia
postganglionic fiber is
LONG
NT:
norepinephrine NE
alpha NE receptor
causes vasoconstriction (GI tract, skin)
beta NE receptor
causes vasodilation
comprised of 2 neurons
first neuron in the CNS
its axon called
preganglionic fiber
myelinated
second neuron in the peripheral ganglion
its axon called
postganglionic fiber
unmyelinated
Parasympathetic
second neuron
postganglionic fiber is
SHORT
neurotransmitter:
ACh
Muscarinic receptor on cardiac and smooth muscle
first neuron in brain stem +spinal cord
preganglionic fiber is
LONG
neurotransmitter:
ACh
Nicotinic receptor on ganglion
Preganglionic Neurons
sympathetic
preganglionic neurons located in
T1-L2
intermediate
lateral
gray matter
called
Thoracolumbar
parasympathetic
preganglionic neurons 1.
brain stem component
CIII, CVII, CIX, CX
preganglionic neurons 2.
spinal cord
S2-S3
specifically in intermediate gray matter
called
Craniosacral
Postganglionic neurons
sympathetic
paravertebral
ganglia associated with ALL 31 spinal nerves
sympathetic train/trunk comprised of highways of symp. neuron axons
rami communicante
(communicating branches) form connections with spinal nerves
will control blood vessels, erector pilli, sweat glands
prevertebral aka preaortic
3 primary prevertebral ganglia
superior mesenteric
splanchnic nerves
form connections of symp. trunk with prevertebral ganglia
will control visceral organs (heart and intestines)
inferior mesenteric
celiac
parasympathetic