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14-September-2008 18:02:45 - Atrium heart Redirected from Atrium anatomy In anatomy, the atrium plural: atria refers to a chamber or space. It may be the atrium of the lateral ventricle in the brain or the blood collection chamber of a heart. It has a thin-walled structure that allows blood to return to the heart. There is at least one atrium in animals with a closed circulatory system. In fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. In other vertebrate groups, the circulatory system is much more complicated. Their circulatory systems are divided into two types: a three-chambered heart, with two atria and one ventricle, or a four-chambered heart, with two atria and two ventricles. The atrium receives blood as it returns to the heart to complete a circulating cycle, whereas the ventricle pumps blood out of the heart to start a new cycle. Human heart Humans have a four-chambered heart. The right atrium receives de-oxygenated blood from the superior vena cava, inferior vena cava and coronary sinus. The left atrium receives oxygenated blood from the left and right pulmonary veins. The atria do not have valves at their inlets. As a result, a venous pulsation is normal and can be detected in the jugular vein. Internally, there is the rough musculae pectinati and crista terminalis, which acts as a boundary inside the atrium and the smooth walled part derived from the sinus venosus. There is also a fossa ovalis in the interatrial septum which is used in the fetal period as a means of bypassing the lung. There are two atria, one on either side of the heart. On the right side is the atrium that holds blood that needs oxygen. It sends blood to the right ventricle which sends it to the lungs for oxygen. After it comes back, it is sent to the left atrium. The blood is pumped from the left atrium and sent to the left ventricle where it is sent to the aorta which takes it to the rest of the body. See also Atrial syncytium Atrial fibrillation v d e Anatomy of torso, cardiovascular system: heart Structures atria interatrial septum, musculi pectinati ventricles interventricular septum, trabeculae carneae, chordae tendinae, papillary muscle valves cusps Regions base apex grooves coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular surfaces sternocostal, diaphragmatic borders right, left Right heart vena cavae, coronary sinus → right atrium atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus → tricuspid valve → right ventricle conus arteriosus, moderator band/septomarginal trabecula → pulmonary valve → pulmonary artery and pulmonary circulation Left heart pulmonary veins → left atrium atrial appendage → mitral valve → left ventricle → aortic valve aortic sinus → aorta and systemic circulation Layers pericardium: fibrous pericardium serous pericardium pericardial cavity, epicardium/visceral layer pericardial sinus myocardium endocardium cardiac skeleton fibrous trigone, fibrous rings Conduction system Cardiac pacemaker SA node AV node bundle of His Purkinje fibers This cardiovascular system article is a stub. Retrieved from http://en..org/wiki/Atrium_heart Categories: Cardiovascular system stubs | Cardiac anatomy Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Bosanski Català Español Français Italiano Latina Lietuvių Nederlands ‪Norsk nynorsk‬ Polski Português РуÑ?Ñ?кий Svenska This page was last modified on 29 August 2008, at 11:25
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