Inferior vena cava - wikipedia Inferior vena cava Inferior vena cava Superior vena cava, inferior vena cava, azygos vein and their tributaries Details Source common iliac vein lumbar veins testicular vein renal vein suprarenal vein hepatic vein Drains to right atrium Artery abdominal aorta Identifiers Latin vena cava inferior MeSH A07. 231.908. 949.648 TA A12. 3.09. 001 FMA 10951 Anatomical terminology ( edit on Wikidata ) The inferior vena cava ( or IVC ) ( Latin : vena, `` vein '', cavus, `` hollow '' ) is a large vein that carries deoxygenated blood from the lower and middle body into the right atrium of the heart. Its walls are rigid and has valves so the blood does not flow down via gravity. It is formed by the joining of the right and the left common iliac veins, usually at the level of the fifth lumbar vertebra. The inferior vena cava is the lower ( `` inferior '' ) of the two venae cavae, the two large veins that carry deoxygenated blood from the body : the inferior vena cava carries blood from the lower half of the body whilst the superior vena cava carries blood from the upper half of the body. It is a large retroperitoneal vein that lies posterior to the abdominal cavity and runs along the right side of the vertebral column. It enters the right atrium at the lower right, back side of the heart. Contents 1 Structure 1.1 Tributaries 1.2 Development 1.3 Variation 2 Function 3 Clinical significance 4 Additional images 5 See also 6 References 7 External links Structure The inferior vena cava is formed by the joining of the left and right common iliac veins and brings collected blood into the right atrium of the heart. It also joins with the azygos vein ( which runs on the right side of the vertebral column ) and venous plexuses next to the spinal cord. The inferior vena cava begins as the left and right common iliac veins behind the abdomen unite, at about the level of L5. It passes through the thoracic diaphragm at the caval opening at the level of T8. Tributaries The specific levels of the tributaries are as follows : Level Vein T8 hepatic veins, inferior phrenic vein L1 right suprarenal vein, renal veins L2 right gonadal vein L1 -- L5 lumbar veins L5 common iliac veins Because the inferior vena cava is located to the right of the midline, drainage of the tributaries is not always symmetrical. On the right, the gonadal veins and suprarenal veins drain into the inferior vena cava directly. On the left, they drain into the renal vein which in turn drains into the inferior vena cava. By contrast, all the lumbar veins and hepatic veins usually drain directly into the inferior vena cava. Development In the embryo, the inferior vena cava and right atrium are separated by the valve of the inferior vena cava, also known as the Eustachian valve. In the adult, this valve typically has totally regressed or remains as a small fold of endocardium. Variation Rarely, the inferior vena cava may vary in its size and position. In transposition of the great arteries the inferior vena cava may lie on the left. It may be replaced by two vessels beneath the level of the renal veins. Function The inferior vena cava is a vein. It carries deoxygenated blood from the lower half of the body to the right atrium of the heart. The corresponding vein that carries deoxygenated blood from the upper half of the body is the superior vena cava. Clinical significance Health problems attributed to the IVC are most often associated with it being compressed ( ruptures are rare because it has a low intraluminal pressure ). Typical sources of external pressure are an enlarged aorta ( abdominal aortic aneurysm ), the gravid uterus ( aortocaval compression syndrome ) and abdominal maligancies, such as colorectal cancer, renal cell carcinoma and ovarian cancer. Since the inferior vena cava is primarily a right - sided structure, unconscious pregnant women should be turned on to their left side ( the recovery position ), to relieve pressure on it and facilitate venous return ( ( citation needed ) ). In rare cases, straining associated with defecation can lead to restricted blood flow through the IVC and result in syncope ( fainting ). Blockage of the inferior vena cava is rare, and is treated urgently as a life - threatening condition. It is associated with deep vein thrombosis, IVC filters, liver transplantation and surgical procedures such as the insertion of a catheter in the femoral vein in the groin. Branches of Inferior Vena Cava Trauma to the vena cava is usually fatal as unstoppable excessive blood loss occurs. Additional images Inferior vena cava Inferior vena cava front view See also Atriocaval shunt Inferior vena cava syndrome Recovery position References Jump up ^ Turhan Yavuz ; Nazli, C ; Kinay, O ; Kutsal, A ( 2002 ). `` Giant Eustachian Valve : with Echocardiographic Appearance of Divided Right Atrium ''. Texas Heart Institute Journal. 29 ( 4 ) : 336 -- 8. PMC 140300. PMID 12484622. ^ Jump up to : Susan Standring ; Neil R. Borley ; et al., eds. ( 2008 ). Gray 's anatomy : the anatomical basis of clinical practice ( 40th ed. ). London : Churchill Livingstone. ISBN 978 - 0 - 8089 - 2371 - 8. Jump up ^ Brophy, CM ; Evans, L ; Sumpio, BE ( 1993 ). `` Defecation syncope secondary to functional inferior vena caval obstruction during a Valsalva maneuver ''. Annals of Vascular Surgery. 7 ( 4 ) : 374 -- 7. PMID 8268080. doi : 10.1007 / BF02002893. Jump up ^ Geehan DM, Inferior Vena Caval Thrombosis, emedicine.com, URL : http://www.emedicine.com/med/topic2718.htm, Accessed : August 3, 2005. External links Anatomy photo : 40 : 13 - 0101 at the SUNY Downstate Medical Center - `` Posterior Abdominal Wall : Tributaries to the Inferior Vena Cava '' Cross section image : pembody / body12a -- Plastination Laboratory at the Medical University of Vienna Veins of the abdomen and pelvis To azygos system ascending lumbar subcostal IVC ( Systemic ) To IVC or left renal vein inferior phrenic hepatic central veins of liver liver sinusoid suprarenal renal gonadal ovarian ♀ / testicular ♂ pampiniform plexus ♂ lumbar common iliac Common iliac Unpaired median sacral vein Internal iliac posterior : iliolumbar superior gluteal lateral sacral anterior : inferior gluteal obturator uterine ♀ uterine plexus ♀ vesical vesical plexus prostatic plexus ♂ deep of penis ♂ / clitoris ♀ posterior scrotal ♂ / labial ♀ vaginal plexus / vein ♀ middle rectal internal pudendal inferior rectal bulb of penis ♂ / vestibule ♀ rectal plexus External iliac inferior epigastric deep circumflex iliac vein Portal vein ( Portal ) Splenic short gastric left gastroepiploic pancreatic inferior mesenteric superior rectal left colic Superior mesenteric right gastroepiploic pancreaticoduodenal jejunal ileal middle colic right colic ileocolic appendicular Direct cystic left gastric / esophageal right gastric paraumbilical Retrieved from `` https://en.wikipedia.org/w/index.php?title=Inferior_vena_cava&oldid=786524355 '' Categories : Veins of the torso Hidden categories : Medicine infobox template using GraySubject or GrayPage Articles containing Latin - language text Talk Contents About Wikipedia Azərbaycanca Català Čeština Deutsch Español Euskara فارسی Français Galego Hrvatski Italiano Қазақша Magyar Bahasa Melayu Nederlands 日本 語 Polski Português Русский Slovenčina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska Türkçe 中文 Edit links This page was last edited on 20 June 2017, at 00 : 44. 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Question: is the vena cava a vein or artery
Answer: vein