Re: Questions for the Pelvic Nerves and Vessels

Comments:
: : Questions for the Pelvic Nerves and Vessels : : These questions were not submitted by the lecturer. : : True/False - September 12, 2011 : : Visceral afferent fibers that connect to the cell bodies of pelvic splanchnic nerves are part of the autonomic nervous system. : F - by definition, autonomic is a motor system. No visceral afferent fibers allowed... : : A transection of the spinal cord superior to the S2 cord level preserves spinal reflexes of micturition. : T : : Spinal cord levels S2-4 elaborate somatic and autonomic nerves that act together to mediate micturition, defecation, and ejaculation. : T : : Like the sympathetic nerves of the coronary arteries, the sympathetic nerves of the perineum dilate the helicine arteries. : F - the parasympathetic pelvic splanchnic nerves (nervi erigenti) dilate the helicene arteries. The sympathetic (lumbar splanchnic?) innervation contributes to helicene artery constriction. : : Similar to peristalsis along the alimentary canal, parasympathetic nerves of the perineum control peristalsis of the seminal vesicles and ejaculatory ducts. : F - sympathetic control peristalsis of seminal vesicles and ejaculatory ducts. Lumbar splanchnic or other nerves? : : Lumbar splanchnic nerves and pelvic splanchnic nerves are sources of sympathetic supply to the pelvic plexus. : F - pelvic splanchnics are parasympathetic : : The right and left hypogastric nerves convey visceral afferent fibers from the uterus and sympathetic supply to the Uterus. : T? : : Lesioning of the hypogastric nerves to disrupt visceral afferent fibers as a treatment for intractable pain removes all sympathetic supply to the uterus. : F - still some input from lumbar and sacral splanchnics? : : Despite lesioning of the hypogastric nerves, there are at least two other pathways that convey sympathetic fibers to the uterus. : See above... : : Sacral splanchnic nerves are postganglionic and pelvic splanchnic nerves are preganglionic. : T : : The cavernous nerves are part of the prostatic autonomic plexus. : T : : The cavernous nerves are a continuation of fibers from the sacral splanchnic nerves. : F - parasympathetic pelvic splanchnic nerves : : 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. : T : : The external anal sphincter is a somatic muscle innervated by the inferior rectal branches of the pudendal nerve. : T : : Disruption of the pelvic splanchnic nerves is expected to cause impotence. : T : : The pudendal nerve typically elaborates the inferior rectal nerve immediately proximal to the entrance of the pudendal canal. : T - or while within canal : : The falciform edge is on the medial margin of the ischio tuberosity and contributes a bony wall of the pudendal canal. : T : : The distal opening of the pudendal canal is at the inferior edge of the urogenital diaphragm. : T? : : 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. : T? : : An infection of the perianal skin may involve superficial inguinal lymph nodes and somatic pain. : T : : True/False - September2010 : : Sacral splanchnic nerves and pelvic splanchnic nerves are, in fact, the same nerves. : F : : Parasympathetic preganglionic cell bodies that mediate contraction of the detrusor muscle are located in the intermediolateral cell column at levels L1-2. : Cord level or spinal column level? - The level in the spinal column would be right, but the ventral rami of the pelvic splanchnics arise from S2-S4 cord levels. : : Peristalsis of the hindgut is driven by the parasympathetic division of the autonomic nervous system. : T - by the pelvic splanchnic nerves : : Relaxation of the external anal sphincter and the puborectalis is driven by the somatic nervous system. : T : : The helicine arteries dilate in response to parasympathetic activity. : T : : The bulbospongiosus and the ischiocavernosus muscles contract in response to the somatic nervous system. : T : : Peristalsis of the vas deferens is driven by sympathetic nerves from the pelvic plexus. : T : : The cerebral release mechanism for urination is mostly driven by the somatic nervous system. : T? - The general visceral afferent fibers sending inputs to the CNS are somatic, and control over the sphincter urethrae is somatic. : : Both the true urethral sphincter and the function urethral sphincter (uvula) are driven by the somatic nervous system. : F - internal is driven by autonomic system (parasympathetic) : : Sensation from the glans of the penis/clitoris is mediated by the autonomic nervous system. : F - again with the "it's only a motor system" mantra : : The sacral splanchnic nerves contribute to the inferior hypogastric plexus. : T : : The pelvic splanchnic nerves contribute to the inferior hypogastric plexus. : T : : The right and left hypogastric nerves contribute to the inferior hypogastric plexus. : T : : Gray rami from the sacral sympathetic trunk contribute to the inferior hypogastric plexus. : T - as an origin for lumbar splanchnic nerves? : : White rami from the sacral sympathetic trunk contribute to the inferior hypogastric plexus. : F - there are no white rami "down there" : : Nerve fibers derived from the lumbar splanchnic nerves contribute to the inferior hypogastric plexus. : T : : The uterine autonomic plexus receives contributions from the inferior hypogastric plexus. : T : : The uterine autonomic plexus receives contributions from the internal iliac plexus. : umm...what's the internal iliac plexus? If it's another name for the superior hypogastric plexus, then yes, post-ganglionic sympathetic nerves that came through that plexus to synapse in the inferior hypogastric plexus continue to the uterine plexus. : : The hypogastric nerves contain both preganglionic and postganglionic sympathetic nerves. (this is true) : : The cavernous nerves pass through the urogenital diaphragm to arrive in the perineum. : T : : Pelvic splanchnic nerves, by way of the inferior hypogastric plexus, contribute to the cavernous nerves. : T : : Surgical resection of the prostate may damage the cavernous nerves. : T : : Peristalsis at the left colic flexure is indirectly inhibited by lumbar splanchnic nerves. : T : : Peristalsis at the left colic flexure is indirectly activated by sacral splanchnic nerves. : F - by pelvic splanchnic nerves

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