SUPERIOR HYPOGASTRIC PLEXUS (presacral nerve)

  

DESCRIPTION: The plexus is a plexus for the sacral or pelvic part of the abdomen. It is placed anterior and below the bifurcation of the aorta and lies under the parietal peritoneum. It is a mixed plexus containing sensory and motor components. The sensory component is notorious for pain they cause in dysmenorrhea. The plexus can therefore be removed surgically, to cure intractable pain of this origin in the procedure called presacral neurectomy. The important motor function is ejaculation of semen in the male brought about by contraction of the bulbospongiosus. This can be performed in paraplegics through pacemaker stimulator on the anterior abdominal wall. The plexus is formed by branches from the following

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Aortic plexus

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3rd lumbar splanchnic nerve

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4th lumbar splanchnic nerve

It then divides into its terminal branches, which are the left and right hypogastric nerves that enter the two inferior hypogastric plexuses.

BRANCHES:

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Right hypogastric nerve

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Left hypogastric nerve

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Branch to ureteric plexus

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Branch to testicular plexus

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Branch to ovarian plexus

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Branch to common iliac plexus

FUNCTIONAL COMPONENTS:

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GVE sympathetic vasomotor fibers from roots L1-4.

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GVA sympathetic sensory fibers whose cell bodies are placed in the L1-4 spinal ganglia through the thoracic splanchnic nerves.

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GVE fibers from the parasympathetic sacral outflow MAY/MAY NOT be available

ROOT: The vasomotor sympathetic fibers originate from the ventral part of the intermediolateral horn of L1-4 spinal cord segments while their sensory branches have their pseudounipolar cell bodies in the spinal ganglia L1-4, and their roots in the dorsal part of the intermediolateral horn of L1-4.

 

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Creator: Oluwole Ogunranti


 

 

 

 

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Creator: Oluwole Ogunranti