Autonomic Nerve Supply of Abdomen and Pelvis Flashcards Preview

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Flashcards in Autonomic Nerve Supply of Abdomen and Pelvis Deck (21)

From which spinal cord segments do the preganglionic sympathetic fibers originate from in the lateral gray horn for those fibers that innervate the abdominal and pelvic viscera?

T5 to L2 or L3


Which nerves supply preganglionic sympathetic nerves to the abdominopelvic viscera? (high yield)

Thoracic, lumbar, and sacral splanchnic nerves


What two ganglia do presympathetic fibers from the thoracic lumbar and sacral splanchnic nerves reach?

The prevertebral (collateral ganglia) and the hypogastric plexus


What are the 4 named ganglia based on the closely associated arteries in the abdominal region?

Celiac ganglion, superior mesentaric ganglion, aorticorenal ganglion, inferior mesentaric ganglion


From which vertebrae do the greater splanchnic nerves arise, and where do they synapse?

Arise from T5-T9, synapse in celiac ganglion


From which vertebrae do the lesser splanchnic nerves arise, and where do they synapse?

Arise in T10, T11 and synapse in the superior mesenteric ganglion


From which vertebrae do the least splanchnic nerves arise, and where do they synapse?

Arise in T12, synapse in the aorticorenal ganglion


From which vertebrae do the lumbar splanchnic nerves arise, and where do they synapse?

Arise from L1, L2, maybe L3. Synapse in inferior mesenteric ganglion and postganglionic neurons in scattered hypogastric plexuses


From which vertebrae do the sacral splanchnic nerves arise, and where do they synapse?

Arise in L1, L2, maybe L3. Synapse in postganglionic neurons scattered in hypogastric plexuses


What plexus supplies the pelvic organs?

The hypogastric plexuses (superior and inferior)


What forms the superior hypogastric plexus?

Postganglionic sympathetic fibers from the inferior mesenteric ganglia
Preganglionic and some postganglionic sympathetic fibers from lower lumbar splanchnic nerves


What two nerves arise from the superior hypogastric plexus?

Right and left hypogastric nerves which descend into the pelvis


What gives rise to the inferior hypogastric plexus? By which organs are these plexuses situated?

The right and left hypogastric nerves which arose from the superior hypogastric plexus give rise to left and right inferior hypogastric plexuses. They are near the rectum, uterine cervix, and urinary bladder.


What is everything that the inferior hypogastric plexus receives contributions from?

Receives all plexi that are coming down from the hypogastric nerves plus the sacral splanchnic nerves


What are the two sources of parasympathetic supply to abdomen and pelvis?

Pelvic splanchnic nerves (S2 S3 S4) and the vagus nerve


What areas of abdomen does the vagus nerve supply?

Sends branches to celiac plexus, superior mesenteric plexus, ad aorticorenal plexus thus supplying all of the foregut and midgut areas.


What makes up pelvic splanchnic nerves? What regions do they supply?

Preganglionic parasympathetic fibers from spinal cord levels and spinal nerves S2, S3, and S4.

Supply the hindgut and all pelvic organs


(High yield) What fibers make up the following plexuses:
1. Celiac plexus, superior mesenteric plexus, aorticorenal plexus, intermesenteric plexus, and inferior mesenteric plexus
2. Superior hypogastric plexus and hypogastric nerves
3. Inferior hypogastric (pelvic) plexus

1. Preganglionic sympathetic fibers, sympathetic ganglia, postganglionic sympathetic fibers, preganglionic parasympathetic fibers, and visceral sensory (afferent) fibers

2. Pregang. sympth. fibers, scattered postganglionic sympathetic neurons, postgang. sympth. fibers , preganglionic parasympathetic fibers, visceral sensory (afferent) fibers

3. Pregang. sympth. fibers, scattered postgang. sympth. neurons, postgang. sympth. fibers, pregang. parsympth. fibers, scattered postgang. parasympth. neurons, postgang. parasympth. fibers, visceral sensory fibers


What path (of another nerve track) do the visceral afferents in the abdomen follow? In the thorax?

All abdominal visceral afferent fibers follow the sympathetic innervation. MOST thoracic do, but not all


What are the spinal cord segments in which visceral afferent pain fibers innervate (from abdomen and pelvis)?

The visceral afferents follow sympathetic fibers back to sympathetic trunk and connect to spinal nerve via white communicating ramus to levels of T1 through L2


Describe the pathway of visceral afferents for:
Most pelvic organs

Most pelvic organs follow the pelvic splanchnic nerves to S2-S4

This does not hold true for the fundus of the uterus, which has fibers following sympathetic innervation (to T11-T12) back (but the body and cervix follow parasympathetic)
The roof of the bladder also follows sympathetic (to T11-L2) while the floor follows parasympathetic