Rectal venous plexus: Difference between revisions
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{{Infobox Vein | |
{{Infobox Vein | |
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Name = |
Name = Rectal venous plexus | |
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Latin = Plexus venosus rectalis, < |
Latin = Plexus venosus rectalis, <br>plexus haemorrhoidalis | |
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GraySubject = 173 | |
GraySubject = 173 | |
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GrayPage = 676 | |
GrayPage = 676 | |
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DorlandsSuf = 12648664 | |
DorlandsSuf = 12648664 | |
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The '''rectal venous plexus''' (or '''hemorrhoidal plexus''') surrounds the [[rectum]], and communicates in front with the [[vesical venous plexus]] in the male, and the [[uterovaginal plexus]] in the female. |
The '''rectal venous plexus''' (or '''hemorrhoidal plexus''') surrounds the [[rectum]], and communicates in front with the [[vesical venous plexus]] in the male, and the [[uterovaginal plexus]] in the female. |
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A free communication between the portal and systemic venous systems is established through the rectal venous plexus. |
A free communication between the portal and systemic venous systems is established through the rectal venous plexus. |
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==Parts== |
==Parts== |
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It consists of two parts, an internal in the submucosa, and an external outside the muscular coat. |
It consists of two parts, an internal in the submucosa, and an external outside the muscular coat. |
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===Internal plexus=== |
===Internal plexus=== |
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* The middle part of the external plexus is drained by the [[middle rectal vein]] which joins the [[internal iliac vein]]. |
* The middle part of the external plexus is drained by the [[middle rectal vein]] which joins the [[internal iliac vein]]. |
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* The upper part of the external plexus is drained by the [[superior rectal vein]] which forms the commencement of the [[inferior mesenteric vein]], a tributary of the [[portal vein]]. |
* The upper part of the external plexus is drained by the [[superior rectal vein]] which forms the commencement of the [[inferior mesenteric vein]], a tributary of the [[portal vein]]. |
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==Support== |
==Support== |
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{{Gray's}} |
{{Gray's}} |
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{{Veins}} |
{{Veins}} |
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[[Category:Veins of the torso]] |
[[Category:Veins of the torso]] |
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[[Category:Rectum]] |
[[Category:Rectum]] |
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Revision as of 14:47, 21 June 2013
Rectal venous plexus | |
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Details | |
Drains to | Superior rectal vein |
Identifiers | |
Latin | Plexus venosus rectalis, plexus haemorrhoidalis |
TA98 | A12.3.10.010 |
TA2 | 5031 |
FMA | 18933 |
Anatomical terminology |
The rectal venous plexus (or hemorrhoidal plexus) surrounds the rectum, and communicates in front with the vesical venous plexus in the male, and the uterovaginal plexus in the female.
A free communication between the portal and systemic venous systems is established through the rectal venous plexus.
Parts
It consists of two parts, an internal in the submucosa, and an external outside the muscular coat.
Internal plexus
The internal plexus presents a series of dilated pouches which are arranged in a circle around the tube, immediately above the anal orifice, and are connected by transverse branches.
This internal plexus is also known in some medical communities as the Irving plexus.
External plexus
- The lower part of the external plexus is drained by the inferior rectal veins into the internal pudendal vein
- The middle part of the external plexus is drained by the middle rectal vein which joins the internal iliac vein.
- The upper part of the external plexus is drained by the superior rectal vein which forms the commencement of the inferior mesenteric vein, a tributary of the portal vein.
Support
The veins of the hemorrhoidal plexus are contained in very loose connective tissue, so that they get less support from surrounding structures than most other veins, and are less capable of resisting increased blood-pressure.
This article incorporates text in the public domain from page 676 of the 20th edition of Gray's Anatomy (1918)