Pelvic Nerves and Vessels

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Questions for the Pelvic Nerves and Vessels

True/False - September 12, 2011

1. Visceral afferent fibers that connect to the cell bodies of pelvic splanchnic nerves are part of the autonomic nervous system.
2. A transection of the spinal cord superior to the S2 cord level preserves spinal reflexes of micturition.
3. Spinal cord levels S2-4 elaborate somatic and autonomic nerves that act together to mediate micturition, defecation, and ejaculation.
4. Like the sympathetic nerves of the coronary arteries, the sympathetic nerves of the perineum dilate the helicine arteries.
5. Similar to peristalsis along the alimentary canal, parasympathetic nerves of the perineum control peristalsis of the seminal vesicles and ejaculatory ducts.
6. Lumbar splanchnic nerves and pelvic splanchnic nerves are sources of sympathetic supply to the pelvic plexus.
7. The right and left hypogastric nerves convey visceral afferent fibers from the uterus and sympathetic supply to the Uterus.
8. Lesioning of the hypogastric nerves to disrupt visceral afferent fibers as a treatment for intractable pain removes all sympathetic supply to the uterus.
9. Despite lesioning of the hypogastric nerves, there are at least two other pathways that convey sympathetic fibers to the uterus.
10. Sacral splanchnic nerves are postganglionic and pelvic splanchnic nerves are preganglionic.
11. The cavernous nerves are part of the prostatic autonomic plexus.
12. The cavernous nerves are a continuation of fibers from the sacral splanchnic nerves.
13. The sympathetic supply to the descending colon is by an arterial plexus and the parasympathetic supply is by a retroperitoneal path along the medial margin of the descending colon.
14. The external anal sphincter is a somatic muscle innervated by the inferior rectal branches of the pudendal nerve.
15. Disruption of the pelvic splanchnic nerves is expected to cause impotence.
16. The pudendal nerve typically elaborates the inferior rectal nerve immediately proximal to the entrance of the pudendal canal.
17. The falciform edge is on the medial margin of the ischio tuberosity and contributes a bony wall of the pudendal canal.
18. The distal opening of the pudendal canal is at the inferior edge of the urogenital diaphragm.
19. The primary lymphatic drainage of the superior pole of the ovary is to upper lumbar nodes and the inferior pole drainage is to internal iliac and superficial inguinal nodes.
20. An infection of the perianal skin may involve superficial inguinal lymph nodes and somatic pain.

True/False - September2010

1. Sacral splanchnic nerves and pelvic splanchnic nerves are, in fact, the same nerves.
2. Parasympathetic preganglionic cell bodies that mediate contraction of the detrusor muscle are located in the intermediolateral cell column at levels L1-2.
3. Peristalsis of the hindgut is driven by the parasympathetic division of the autonomic nervous system.
4. Relaxation of the external anal sphincter and the puborectalis is driven by the somatic nervous system.
5. The helicine arteries dilate in response to parasympathetic activity.
6. The bulbospongiosus and the ischiocavernosus muscles contract in response to the somatic nervous system.
7. Peristalsis of the vas deferens is driven by sympathetic nerves from the pelvic plexus.
8. The cerebral release mechanism for urination is mostly driven by the somatic nervous system.
9. Both the true urethral sphincter and the function urethral sphincter (uvula) are driven by the somatic nervous system.
10. Sensation from the glans of the penis/clitoris is mediated by the autonomic nervous system.
11. The sacral splanchnic nerves contribute to the inferior hypogastric plexus.
12. The pelvic splanchnic nerves contribute to the inferior hypogastric plexus.
13. The right and left hypogastric nerves contribute to the inferior hypogastric plexus.
14. Gray rami from the sacral sympathetic trunk contribute to the inferior hypogastric plexus.
15. White rami from the sacral sympathetic trunk contribute to the inferior hypogastric plexus.
16. Nerve fibers derived from the lumbar splanchnic nerves contribute to the inferior hypogastric plexus.
17. The uterine autonomic plexus receives contributions from the inferior hypogastric plexus.
18. The uterine autonomic plexus receives contributions from the internal iliac plexus.
19. The hypogastric nerves contain both preganglionic and postganglionic sympathetic nerves. (this is true)
20. The cavernous nerves pass through the urogenital diaphragm to arrive in the perineum.
21. Pelvic splanchnic nerves, by way of the inferior hypogastric plexus, contribute to the cavernous nerves.
22. Surgical resection of the prostate may damage the cavernous nerves.
23. Peristalsis at the left colic flexure is indirectly inhibited by lumbar splanchnic nerves.
24. Peristalsis at the left colic flexure is indirectly activated by sacral splanchnic nerves.

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