hemorrhoidal plexus

Information about hemorrhoidal plexus

Vein:
Scheme of the anastomosis of the veins of the rectum.
The veins of the right half of the male pelvis.
Latinplexus venosus rectalis, plexus haemorrhoidalis
subject #173 676
Drains tosuperior rectal vein
Dorlands/Elsevierp_24/12648664
The hemorrhoidal plexus (or rectal venous plexus) surrounds the rectum, and communicates in front with the vesical 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 hemorrhoidal 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.

External plexus

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 was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.


Veins [ edit]
superficial - deep - venae comitantes - venous sinuses - pulmonary | (Gray's s164-Gray's s165) heart: coronary sinus - great cardiac - left marginal - small cardiac - right marginal - middle cardiac - posterior of the left ventricle - oblique of the left atrium - anterior cardiac | (Gray's s166) exterior of the head and face: frontal - supraorbital - angular - anterior facial - common facial - deep facial - superficial temporal - posterior facial - transverse facial - pterygoid - internal maxillary - posterior auricular - occipital | (Gray's s167) veins of the neck: external jugular - sinus - posterior external jugular - anterior jugular - internal jugular - inferior petrosal sinus - lingual - ranine - pharyngeal - superior thyroid - middle thyroid - vertebral - deep cervical | (Gray's s168) diploic/veins of the brain: cerebral - superior cerebral - middle cerebral - inferior cerebral - basal - internal cerebral - great cerebral - cerebellar | (Gray's s169-Gray's s170) sinuses of the dura mater: superior sagittal - inferior sagittal - straight - transverse - sigmoid - petrosquamous - occipital - confluence - cavernous | (Gray's s171) ophthalmic: superior ophthalmic - nasofrontal - inferior ophthalmic - intercavernous sinuses - superior petrosal sinus - basilar - emissary | (Gray's s171) upper extremity: superficial (cephalic - median cubital - accessory cephalic - basilic - median antebrachial) - deep (radial - ulnar - brachial - axillary) | (Gray's s172) thorax: subclavian - brachiocephalic - internal thoracic - superior phrenic - inferior thyroid - intercostal (supreme - superior - posterior) - superior vena cava - azygos - hemiazygos - accessory hemiazygos - bronchial | (Gray's s172) vertebral column: external vertebral venous plexuses - internal vertebral venous plexuses - basivertebral - intervertebral - of the medulla spinalis | (Gray's s172) lower extremity: common digital - great saphenous - thoracoepigastric - small saphenous - plantar digital - posterior tibial - peroneal - anterior tibial - popliteal - femoral - profunda femoris | (Gray's s173) abdomen and pelvis: external iliac - inferior epigastric - internal iliac - superior gluteal - inferior gluteal - internal pudendal - hemorrhoidal - pudendal - dorsal of the penis - common iliac - inferior vena cava - spermatic - ovarian - renal - suprarenal - inferior phrenic - hepatic | (Gray's s173) portal system: sinusoids - portal - splenic - short gastric - left gastroepiploic - pancreatic - inferior mesenteric - superior rectal - superior mesenteric - right gastroepiploic - pancreaticoduodenal | (Gray's s174) fetal: ductus venosus - umbilical | (Gray's s139)
The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long.
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pelvis (pl. pelvises or pelves) is the bony structure located at the base of the spine (properly known as the caudal end). The pelvis incorporates the socket portion of the hip joint for each leg (in bipeds) or hind leg (in quadrupeds).
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Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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The inferior mesenteric vein begins in the rectum as the superior rectal vein (superior hemorrhoidal vein), which has its origin in the hemorrhoidal plexus, and through this plexus communicates with the middle and inferior hemorrhoidal veins.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long.
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Vesical plexus can refer to:
  • vesical nervous plexus
  • vesical venous plexus

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Uterovaginal plexus can refer to:
  • Uterovaginal plexus (nerves)
  • A compound structure consisting of the uterine venous plexus and vaginal venous plexus

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The lower part of the external hemorrhoidal plexus is drained by the inferior rectal veins (or inferior hemorrhoidal veins) into the internal pudendal vein.

This article was originally based on an entry from a public domain edition of Gray's Anatomy.
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The internal pudendal veins (internal pudic veins) are the venæ comitantes of the internal pudendal artery.

They begin in the deep veins of the penis which issue from the corpus cavernosum penis, accompany the internal pudendal artery, and unite to form a single vessel,
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The middle rectal veins (or middle hemorrhoidal vein) take origin in the hemorrhoidal plexus and receive tributaries from the bladder, prostate, and seminal vesicle.

They run lateralward on the pelvic surface of the Levator ani to end in the hypogastric vein.
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The internal iliac vein (hypogastric vein) begins near the upper part of the greater sciatic foramen, passes upward behind and slightly medial to the hypogastric artery and, at the brim of the pelvis, joins with the external iliac to form the common iliac vein.
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The inferior mesenteric vein begins in the rectum as the superior rectal vein (superior hemorrhoidal vein), which has its origin in the hemorrhoidal plexus, and through this plexus communicates with the middle and inferior hemorrhoidal veins.
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In human anatomy, the inferior mesenteric vein (IMV) is a blood vessel that drains blood from the large intestine. It usually terminates when reaching the splenic vein, which goes on to form the portal vein with the superior mesenteric vein (SMV).
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Portal vein can refer to:
  • the hepatic portal vein, a large vein that carries blood from the digestive tract to the liver and is formed by the splenic vein and superior mesenteric vein
  • a vein that is part of a portal venous system and connects two systems of capillary beds

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Blood pressure (strictly speaking: vascular pressure) refers to the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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vein is a blood vessel that carries blood toward the heart. The majority of veins in the body carry low-oxygen blood from the tissues back to the heart; the exceptions being the pulmonary and umbilical veins which both carry oxygenated blood.
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Superficial vein is a term used to describe a vein that is close to the surface of the body. It is used to differentiate veins that are close to the surface from veins that are far from the surface, known as deep veins.
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Deep vein is a term used to describe a vein that is deep in the body. It is used to differentiate deep veins from veins which are close to the surface, also known as superficial veins.

Deep veins are almost always beside an artery with the same name (e.g.
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Vena comitans is Latin for accompanying vein. It refers to a vein that is usually paired, with both veins lying on the sides of an artery. Because they are generally found in pairs, they are often referred to by their plural form: venae comitantes.
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The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are venous channels found between layers of dura mater in the brain.
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The pulmonary veins carry oxygen-rich blood from the lungs to the left atrium of the heart. They are the only veins in the post-fetal human body that carry oxygenated (red) blood.

The pulmonary veins return the oxygenated blood from the lungs to the left atrium of the heart.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart. It is present in humans and other animals.
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The Great Cardiac Vein (left coronary vein) begins at the apex of the heart and ascends along the anterior longitudinal sulcus to the base of the ventricles.
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left marginal vein, is of considerable size, and ascends along the left margin of the heart.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.
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The small cardiac vein (right coronary vein) runs in the coronary sulcus between the right atrium and ventricle, and opens into the right extremity of the coronary sinus.
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