An anastomosis (plural anastomoses, from gr. ἀναστόμωσις, communicating opening) is a network of streams that both branch out and reconnect, such as blood vessels or leaf veins. The term is used in medicine, biology, and geology.

Contents 1 Medicine 2 Biology 3 Geology 4 References

Medicine

Anastomosis is the connection of two structures. ^[1] It refers to connections between blood vessels or between other tubular structures such as loops of intestine. The blood vessels are part of the Circulatory system and function to transport Blood throughout the body In Anatomy, the intestine is the segment of the alimentary canal extending from the Stomach to the Anus and in humans and other mammals consists In circulatory anastomosis, many arteries naturally anastomose with each other, for example the inferior epigastric artery and superior epigastric artery. Anastomoses occur normally in the body in the Circulatory system, serving as backup routes for blood to flow if one link is blocked or otherwise compromised In Human anatomy, inferior epigastric artery refers to the Artery that arises from the External iliac artery and anastomoses with the Superior epigastric In Human anatomy, superior epigastric artery refers to a Blood vessel that carries oxygenated Blood and arises from the Internal thoracic artery Surgical anastomosis occurs when a segment of intestine is resected and the two remaining ends are sewn or stapled together (anastomosed), for example Roux-en-Y anastomosis. In surgical jargon to create an Anastomosis is to join together two hollow organs (viscus usually to restore continuity after resection or to bypass an unresectable disease process In General surgery, a Roux-en-Y anastomosis, less formally and precisely Roux-en-Y, is a surgically created ( end-to-side) Anastomosis The procedure is referred to as intestinal anastomosis.

Pathological anastomosis results from trauma or disease and may involve veins, arteries, or intestines. Pathology (from Greek grc πάθος pathos, "fate harm" and grc -λογία -logia) is the study and In the Circulatory system, a vein is a Blood vessel that carries Blood back toward the Heart (as opposed to Artery, a blood vessel Arteries are Blood vessels that carry blood away from the Heart. These are usually referred to as fistulas. In medicine a fistula (pl fistulas or fistulae is an abnormal connection or passageway between two Epithelium -lined organs or vessels that normally do not connect In the cases of veins or arteries, traumatic fistulas usually occur between artery and vein. Traumatic intestinal fistulas usually occur between two loops of intestine (enetero-enteric fistula) or intestine and skin (enterocutaneous fistula). The skin is the outer covering of living tissue of an animal (or plant Portacaval anastomosis, by contrast, is an anastomosis between a vein of the portal circulation and a vein of the systemic circulation, which allows blood to bypass the liver in patients with portal hypertension, often resulting in hemorrhoids, esophageal varices, or caput medusae. A portacaval anastomosis (also known as portal systemic anastomosis) is a specific type of Anastomosis that occurs between the veins of Portal circulation In the Circulatory system of animals a portal venous system occurs when a Capillary bed drains into another capillary bed through Veins Both capillary Systemic circulation is the portion of the Cardiovascular system which carries Oxygenated Blood away from the heart to the Body, and returns In Medicine, portal hypertension is Hypertension (high blood pressure in the Portal vein and its branches Hemorrhoids ( AmE) haemorrhoids ( BrE) emerods, or piles are varicosities or swelling and Inflammation In Medicine ( Gastroenterology) esophageal varices are extremely dilated sub-mucosal Veins in the Esophagus. Caput medusae is the appearance of distended and engorged Paraumbilical veins which are seen radiating from the Umbilicus across the abdomen to join Systemic

Biology

In evolution, anastomosis is a recombination of evolutionary lineage. eVolution is the third Album by eLDee, it was due to be released in 2008 Conventional accounts of evolutionary lineage present themselves as the simple branching out of species into novel forms. Under anastomosis, species might recombine after initial branching out, such as in the case of recent research which shows that humans and chimpanzees may have interbred after an initial branching out. ^[2] The concept of anastomosis also applies to the theory of symbiogenesis, in which new species emerge from the formation of novel symbiotic relationships. Symbiogenesis is the merging of two separate organisms to form a single new organism In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank.

Geology

In geology, anastomosis refers to quartz (or other) veins displaying this property, which is often related to shearing in metamorphic regions. Geology (from Greek γη gê, "earth" and λόγος Logos, "speech" lit There is also a type of stream called anastomosing, which consists of a wide strath and multiple thalwegs divided by vegetated stabilized islands within subparallel banks.

References

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