Coronary sinus - wikipedia Coronary sinus Coronary sinus Back ( posterior ) side of the heart, with coronary sinus ( blue ) labeled Interior of heart, viewed from the front ( opening of coronary sinus is labeled ) Details Precursor Sinus venosus Source Great cardiac vein Drains to Right atrium Identifiers Latin Sinus coronarius Dorlands / Elsevier s_12 / 12738662 TA A12. 3.01. 002 FMA 4706 Anatomical terminology ( edit on Wikidata ) This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please help to improve this article by introducing more precise citations. ( June 2015 ) The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle ( myocardium ). It delivers less - oxygenated blood to the right atrium, as do the superior and inferior vena cavae. It is present in all mammals, including humans. The name comes from the Latin `` corona ', meaning crown, since this vessel forms a partial circle around the heart. The coronary sinus drains into the right atrium, at the coronary sinus orifice, an opening between the inferior vena cava and the right atrioventricular orifice or tricuspid valve. It returns blood from the heart muscle, and is protected by a semicircular fold of the lining membrane of the auricle, the valve of coronary sinus ( or valve of Thebesius ). The sinus, before entering the atrium, is considerably dilated - nearly to the size of the end of the little finger. Its wall is partly muscular, and at its junction with the great cardiac vein is somewhat constricted and furnished with a valve, known as the valve of Vieussens consisting of two unequal segments. Contents 1 Structure 2 Function 3 Additional images 4 See also 5 External links Structure The coronary sinus runs transversely in the left atrioventricular groove on the posterior side of the heart. It is the distal portion of the great cardiac vein feeding into the right atrium. The valve of the coronary sinus is on the posterior, inferior surface of the heart, medial to the inferior vena cava opening, just superior to the septal leaflet of the tricuspid valve. The coronary sinus valve is also known as the Thebesian valve. Tributaries : Great cardiac vein ; Middle cardiac vein ; Small cardiac vein ; Posterior vein of left ventricle ; Oblique vein of left atrium Function The coronary sinus receives blood mainly from the small, middle, great and oblique cardiac veins. It also receives blood from the left marginal vein and the left posterior ventricular vein. It drains into the right atrium. The anterior cardiac veins do not drain into the coronary sinus but drain directly into the right atrium. Some small veins known as smallest cardiac veins drain directly into any of the four chambers of the heart. Additional images Diagram showing completion of development of the parietal veins. Posterior view of coronary circulation See also This article uses anatomical terminology ; for an overview, see Anatomical terminology. Coronary arteries Percutaneous coronary intervention Pressure - controlled intermittent coronary sinus occlusion External links Anatomy figure : 20 : 04 - 03 at Human Anatomy Online, SUNY Downstate Medical Center - `` Posterior view of the heart. '' MedEd at Loyola Radio / curriculum / Vascular / Coronary_sinus. jpg Veins of the thorax and vertebral column Thorax Coronary Coronary sinus Great cardiac ( Left marginal ) Posterior of the left ventricle Oblique of the left atrium ( Ligament of the left vena cava ) Middle cardiac Small cardiac vein Anterior cardiac ( Right marginal ) Smallest cardiac veins Right atrial veins Right ventricular veins Pulmonary right inferior pulmonary vein right superior pulmonary vein left inferior pulmonary vein left superior pulmonary vein superior vena cava Brachiocephalic internal thoracic anterior intercostal superior epigastric left superior intercostal supreme vertebral subclavian axillary : lateral thoracic thoracoepigastric dorsal scapular external jugular pericardiacophrenic internal jugular Azygos right superior intercostal bronchial intercostal / posterior intercostal 5 - 11 accessory hemiazygos / hemiazygos superior phrenic Vertebral column vertebral venous plexuses external internal spinal posterior anterior basivertebral intervertebral Retrieved from `` https://en.wikipedia.org/w/index.php?title=Coronary_sinus&oldid=793809372 '' Categories : Veins of the torso Hidden categories : Medicine infobox template using GraySubject or GrayPage Medicine infobox template using Dorlands parameter Articles lacking in - text citations from June 2015 All articles lacking in - text citations Talk Contents About Wikipedia Deutsch Español فارسی Français Italiano Nederlands Norsk nynorsk Polski Português Svenska ไทย Edit links This page was last edited on 4 August 2017, at 02 : 58. 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Question: the great and small cardiac veins deliver their blood to what vessel
Answer: coronary sinus