Abdominal Nerve Supply Flashcards
What are the sympathetic players for abdominal innervation and what are their roots?
Greater Splanchnic T5 - T9
Lesser Splanchnic T10 - T11
Least Splanchnic T12
Lumbar Splanchnic L1 + L2
Where are the parasympathetics for abdominal innervation coming from? what are their roots?
Anterior and Posterior Vagal Trunks (LARP)
Pelvic Splanchnic (S2,S3,S4)
on the abdominal aorta as the para-aortic autonomic plexus and all of the arteries have peri-arterial plexuses.
Enteric (intrinsic) parasympathetic ganglia – (Post synaptic cells of the PNS)
Vagus nerves carry what?
what is its path?
presynaptic parasympathetic and visceral afferent fibers
it comes from the left and right vagus and we form the anterior and posterior plexus.. they enter through the esophageal hiatus and travel on the vessels to get to their targets.
Vagus supplies all organs up until what point?
the splenic flexure
so it carries presynaptic parasympathetic and visceral afferent fibers to the foregut and midgut
What are the pelvic splanchnic?
where are they derived?
what do they do?
they have nothing to do with sympathetics!
they’re derived from S2-S4
convey PREsynaptic PARAsympathetic fibers to the interior hypogastric (pelvic) plexus
these do the splenic flexure all the way until the pectinate line inferiorly.
of the hypogastric plexuses, which one does the pelvic splanchnic run in?
the inferior hypogastric plexus… not the superior!
Explain the prevertebral ganglion + Postvertebral ganglion pathway of the sympathetic nervous system.
we see these in the intermediolateral cell columns (IMLCC) that are in the lateral horn between T1-L2 (we care about T5-L2 because of the abdomen)
prevertebral ganglion:
lateral horn –> ventral horn –> anterior rams –> white ramus –> pass through paravertebral gangion (says hi and waves) –> leaves as an ABDOMINOPELVIC SPLANCHNIC (greater, lesser least) –> travels to prevertebral ganglion
Postvertebral ganglion:
starting at the prevertebral ganglion –> travel through periarterial plexus on blood vessels to get to their organ.
What are the 4 types of prevertebral ganglion of the sympathetic innervation?
in general.. the greater splanchnic is going to synapse on…?
lumbar synapse on?
lesser + least synapse on?
celiac, Superior mesentaric ganglion, Inferior mesenteric ganglion, aorticorenal
in general:
celiac ganglion
Inferior Mesenteric ganglion
aorticorenal
Why are prevertebral ganglion are called prevertebral because?
they’re in front of aorta and vertebral bodies.
Where does the celiac ganglion sit?
superior mesenteric ganglion?
Inferior Mesenteric ganglion?
aorticorenal ganglion?
celiac ganglion sits superior and inferior to the celiac trunk. (of the abdominal aorta)
at the SMA (of the abdominal aorta)
at the IMA (of the abdominal aorta)
kind of located on the renal arteries. (of the abdominal aorta)
Pain travels with the sympathetics. so whatever the place has in general, you know where it’s going.
the liver for example, where is it going to synapse?
liver is T6-T9. We know that the liver is a foregut structure, which means it’s supplied by the celiac artery, so makes sense that the celiac ganglion would hold it’s impulses.
Kidneys are T10 to L1. what do we know about this and the aorticorenal ganglion?
it encompasses the lesser, least, and part of the lumbar splanchnic
Where do the greater, lesser, and least go through to get from thorax to abdomen?
they pierce the diaphragm. they do NOT go through any hiatus.
Explain how the celiac plexus is a mixed plexus
where the pre and post sympathetic neurons are synapsing, however PNS can travel through there to get to where they want to go. they’re not synapsing, they’re driving through.
celiac plexus is a mix of the parasympathetics from the vagus and the sympathetics from the greater splanchnic (maybe some lesser)
Superior mesenteric plexus. is it mixed or not and why? what are its contributions?
it is mixed. contributions from the celiac, and the lesser and least splanchnic.
