| Right atrium | |
|---|---|
.svg/250px-Diagram_of_the_human_heart_(cropped).svg.png) |
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| Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. | |
 |
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| Interior of right side of heart. | |
| Latin | atrium dextrum |
| Gray's | subject #138 528 |
| Artery | atrial branches of coronary arteries |
| MeSH | Right+Atrium |
| Dorlands/Elsevier | a_71/12167861 |
The right atrium (in older texts termed the "right auricle") is one of four chambers (two atria and two ventricles) in the human heart. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. Arteries are Blood vessels that carry blood away from the Heart. The atrial branches of right coronary artery derive from the Right coronary artery and provide part of the blood supply to the Right atrium and Left atrium Medical Subject Headings ( MeSH) is a huge Controlled vocabulary (or metadata system for the purpose of indexing journal articles and books Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group Heart chamber is a general term used to refer to any of the four chambers of the Mammalian Heart (an organ) Right atrium In Anatomy, the atrium (plural atria) refers to a chamber or space In the Heart, a ventricle is a heart chamber which collects Blood from an atrium (another heart chamber that is smaller than a ventricle and Human beings, humans or man (Origin 1590–1600 L homō man OL hemō the earthly one (see Humus The heart is a muscular organ in all Vertebrates responsible for pumping Blood through the Blood vessels by repeated rhythmic It receives deoxygenated blood from the superior and inferior vena cava and the coronary sinus, and pumps it into the right ventricle through the tricuspid valve. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Blood is a specialized Bodily fluid that delivers necessary substances to the body's cells such as nutrients and oxygen—and transports Waste products The superior vena cava is a large yet short Vein that carries deoxygenated Blood from the upper half of the body to the Heart 's Right atrium The inferior vena cava (or IVC is the large Vein that carries de-oxygenated Blood from the lower half of the body into the Heart. The superior and inferior vena cava are collectively called the venae cavae. The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the Myocardium of the Heart. The right ventricle is one of four chambers (two atria and two ventricles in the Human Heart. The tricuspid valve (also known as the right atrioventricular valve) is on the right side of the heart between the Right atrium and the Right ventricle
The sinoatrial node (SAN) is located within this chamber next to the vena cava. The Sinoatrial node (abbreviated SA node or SAN, also called the sinus node) is the impulse generating (pacemaker tissue located in the Right atrium This is a group of pacemaker cells which spontaneously depolarize to create an action potential. The cardiac action potential then spreads across both atria causing them to contract forcing the blood they hold into their corresponding ventricles.
In early life, when a fetus is in the womb, the right atrium has a hole within its septum through to the left atrium, this makes them continuous with each other which is essential for fetal circulation. A fetus (or foetus or fœtus) is a developing Mammal or other Viviparous Vertebrate, after the Embryonic stage and The interatrial septum is the wall of tissue that separates the right and left atria of the Heart. This junction is called the “Foramen Ovale”. Once born (usually within 9 month's time) the Foreman Ovale seals over. This occurs when the first breath is taken; fetal blood flow is reversed and now travels through the lungs no longer requiring the Foramen Ovale. Therefore it closes and is renamed as the “Fossa Ovalis”. The Fossa Ovalis is seen as an embryonic remnant.
In some cases, the Formane Ovale fails to close and is present in 20% of the general population, however it does not cause problems in the vast majority. This is known as "Patent Foramen Ovale"
The right atrium also holds the coronary sinus which is the opening of the vein that drains the myocardium itself. Myocardium is the muscular tissue of the Heart. Relationship to other layers The other tissues of the heart are the Endocardium Attached to the right atrium is the right auricular appendix. The right atrial appendage (RAA (right auricular appendix right auricula right auricle is a small conical muscular pouch attached to the Right atrium of the Heart
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