INFERIOR HYPOGASTRIC PLEXUS

 

DESCRIPTION: The left and right inferior hypogastric plexuses are formed by the left and right hypogastric nerves, which descend from the superior hypogastric plexus deep to the parietal peritoneum and medial to the internal iliac arteries. They are then joined by the pelvic splanchnic nerves, which are bona fide parasympathetic nerves from the sacral outflow (S2-4). In the male, the inferior hypogastric plexuses are placed lateral to the rectum, seminal vesicle, urinary bladder (its posterior part) and the prostate gland. In the female, they are lateral to the rectum, cervix, upper part of vagina and also the posterior aspect of the urinary bladder. Its parasympathetic fibers ascend in the hypogastric plexus to reach the inferior mesenteric plexus, by passing through the aortic plexuses. It then provides supply to the colon, distal to the junction between the proximal 2/3 and distal 1/3 of transverse colon, (i.e. hindgut) which are as follows

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Distal 1/3 of transverse colon

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Descending colon

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Sigmoid colon

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Rectum and

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Anal canal (upper part).

BRANCHES:

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To all pelvic viscera though their arteries

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Branches to hind gut through parasympathetic fibers ascending into the aortic plexus.

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Special nerves from the plexus are as follows

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Uterine nerves which supply uterus

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Cervical nerve from cervical plexus extending from inferior hypogastric plexus

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Tubal nerves, supplying the uterine tubes

These special nerves are more or less concerned with sexual responses than with other physiological activities.

FUNCTIONAL COMPONENTS:

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GVE sympathetic vasomotor fibers from roots T10-12 and L1-2.

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GVA sympathetic sensory fibers whose cell bodies are placed in the T10-12 and L1-2 spinal ganglia through the thoracic splanchnic nerves and lumbar splanchnic nerves.

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GVE fibers from the parasympathetic sacral outflow S2-S4 called pelvic splanchnic nerves or nervi erigentes

ROOT

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The vasomotor sympathetic fibers originate from the ventral part of the intermediolateral horn of T10-12 and L1-2 spinal cord segments while their sensory branches have their pseudounipolar cell bodies in the spinal ganglia T10-12 and L1-2, and their roots in the dorsal part of the intermediolateral horn of corresponding spinal cord segments.

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 Parasympathetic fibers arise from the ventral aspect of intermediolateral horn of S2-4 spinal cord segments.

 

Electronic School of Medicine
Creator: Oluwole Ogunranti


 

 

 

 

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Creator: Oluwole Ogunranti