Hemorrhoids Rectal Plexus:
The Hemorrhoids Rectal plexus surrounds the anal, and connected with the vesical venous plexus in the male, and the uterovaginal plexus in the female. A free connection between the portal and systemic venous systems is established through the Hemorrhoids Rectal plexus.
Parts of Hemorrhoids Rectal Plexus
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Hemorrhoids Rectal plexus
consists of two parts, an internal in the sub
mucosa, and an external outside the muscular coat.
Internal Rectal plexus
The internal rectal 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 rectal plexus
is also known in some medical communities as the Irving plexus.
External Rectal plexus
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- The lower part of the external Rectal plexus is drained by the inferior rectal veins into the internal pudendal vein
- The middle part of the external Rectal plexus
is drained by the middle rectal vein, which joins the internal iliac vein.
- The upper part of the external Rectal plexus
is drained by the superior rectal vein which forms the commencement of the inferior mesenteric vein, a tributary of the portal vein.
Support of Rectal Plexus
The veins of the Hemorrhoids Rectal 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.
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