Circulatory anastomosis - wikipedia Circulatory anastomosis A circulatory anastomosis is a connection ( an anastomosis ) between two blood vessels, such as between arteries ( arterio - arterial anastomosis ), between veins ( veno - venous anastomosis ) or between an artery and a vein ( arterio - venous anastomosis ). Anastomoses between arteries and between veins result in a multitude of arteries and veins, respectively, serving the same volume of tissue. Such 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, but may also occur pathologically. Contents 1 Physiologic 1.1 Coronary 1.1. 1 Surgical intervention 1.1. 2 Naturally occurring 1.2 Arterio - venous 2 Pathologic 3 References Physiologic Arterio - arterial anastomoses include actual ( e.g., palmar and plantar arches ) and potential varieties ( e.g., coronary arteries and cortical branch of cerebral arteries ). There are many examples of normal arterio - arterial anastomoses in the body. Clinically important examples include : Circle of Willis ( in the brain ) Coronary : anterior interventricular artery and posterior interventricular artery of the heart Scapular anastomosis ( for the subclavian vessels ) Joint anastomoses : Almost all joints receive anastomotic blood supply from more than one source. Shoulder ( and circumflex humeral ) Elbow ( see blood supply of elbow ) Hip ( and circumflex iliac ; see also cruciate anastomosis ) Knee ( and genicular arteries ; see also patellar network ) Ankle Abdominal anastomoses Marginal artery of the colon Pelvic anastomoses Hand - palmar arches : superficial palmar arch and deep palmar arch Foot - plantar arch Coronary Surgical intervention Coronary anastomoses are a clinically vital subject : the coronary anastomosis is the blood supply to the heart. The coronary arteries are vulnerable to arteriosclerosis and other effects. Inadequate supply to the heart will lead to chest pains ( angina ) or a heart attack ( myocardial infarction ). These can be ameliorated by surgical intervention to create a bypass using the anastomosis technique. Naturally occurring Coronary anastomoses are anatomically present though functionally obsolete. There was some suggestion that they may be helpful if a problem develops slowly over time ( this will need to be verified ) but in the case of the pathogenesis of CHD they do not provide a sufficient blood flow to prevent infarction. There are anastomoses between the Circumflex and right coronary arteries and between the anterior and posterior inter-ventricular arteries. In the normal heart these anastomoses are non-functional. Arterio - venous This section needs expansion. You can help by adding to it. ( October 2014 ) Superficial arterio - venous anastomoses open when the body reaches a high temperature, and enable the body to cool itself. As warm arterial blood passes close to the surface it will decrease in temperature. This occurs together with sweating. Pathologic Pathological anastomoses result from trauma or disease and may involve veins, arteries, or intestines. These are usually referred to as fistulas. 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 ( entero - enteric fistula ) or intestine and skin ( enterocutaneous fistula ). Portacaval anastomosis, by contrast, is a veno - venous 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. Circulatory anastomoses between monochorionic twins may result in twin - to - twin transfusion syndrome. References Jump up ^ Johnson, DR. `` Introductory Anatomy : Circulatory System and Blood ''. Archived from the original on 21 February 2011. Retrieved 21 February 2011. Jump up ^ Shulman, Lee S. ; Vugt, John M.G. van ( 2006 ). Prenatal medicine. Washington, DC : Taylor & Francis. pp. Page 447. ISBN 0 - 8247 - 2844 - 0. CS1 maint : Multiple names : authors list ( link ) Arteries and veins Vessels Arteries Nutrient artery Arteriole Metarteriole Capillaries Types Continuous Fenestrated Sinusoidal Precapillary sphincter Precapillary resistance Veins Vena comitans Superficial vein Deep vein Emissary veins Venous plexus Venule Lymph Lymphatic vessel Lymph Lymph capillary Circulatory system Systemic Left heart → Aorta → Arteries → Arterioles → Capillaries → Venules → Veins → Vena cava → ( Right heart ) Pulmonary Right heart → Pulmonary arteries → Lungs → Pulmonary vein → Left heart Microanatomy Tunica intima Endothelium Internal elastic lamina Tunica media Tunica externa Vasa vasorum Vasa nervorum Vascular nerves Rete mirabile Circulatory anastomosis Retrieved from `` https://en.wikipedia.org/w/index.php?title=Circulatory_anastomosis&oldid=801420938 '' Categories : Angiology Hidden categories : CS1 maint : Multiple names : authors list Articles to be expanded from October 2014 All articles to be expanded Articles using small message boxes All articles with unsourced statements Articles with unsourced statements from October 2014 Talk Contents About Wikipedia فارسی Polski Edit links This page was last edited on 19 September 2017, at 15 : 35. 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Question: where do arterial anastomoses occur in the body
Answer: between arteries