File:Gray491.png

DescriptionGray491.png	Deutsch: Blick von hinten auf das Herz. Darstellung von Henry Gray.
Plate InfoField	491
Date	before 1858 date QS:P,+1858-00-00T00:00:00Z/7,P1326,+1858-00-00T00:00:00Z/9
Source	Henry Gray (1918) Anatomy of the Human Body (See "Book" section below) Bartleby.com: Gray's Anatomy, Plate 491
Author	Henry Vandyke Carter  (1831–1897)      Alternative names H. V. Carter Description English anatomist, surgeon and artist Date of birth/death 22 May 1831  4 May 1897  Location of birth/death Kingston upon Hull Scarborough Authority file : Q955620 VIAF: 68771670 ISNI: 0000000064050921 LCCN: nr00037105 Open Library: OL5854674A Oxford Dict.: 50532 WorldCat creator QS:P170,Q955620

Henry Gray: Gray's Anatomy (20th edition)
Author	Henry Gray  (1827–1861)      Description English physician, writer, surgeon, anatomist and biologist Date of birth/death 1827  13 June 1861  Location of birth/death London  London  Authority file : Q40319 VIAF: 57675618 ISNI: 0000000109049757 LCCN: n80023564 NLA: 35141523 Open Library: OL4378105A WorldCat creator QS:P170,Q40319
Editor	Revised by Warren H. Lewis
Illustrator	Henry Vandyke Carter  (1831–1897)      Alternative names H. V. Carter Description English anatomist, surgeon and artist Date of birth/death 22 May 1831  4 May 1897  Location of birth/death Kingston upon Hull Scarborough Authority file : Q955620 VIAF: 68771670 ISNI: 0000000064050921 LCCN: nr00037105 Open Library: OL5854674A Oxford Dict.: 50532 WorldCat creator QS:P170,Q955620
Title	Anatomy of the Human Body
Edition	20
Publisher	Lea & Febiger
Object type	version, edition or translation
Page overview	list of all the plates
Language	English
Publication date	1918
Place of publication	Philadelphia / New York City
Source	Bartleby

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The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart. It is present in humans and other animals. It delivers deoxygenated blood to the Right atrium in conjunction with the superior and inferior vena cava.

The coronary sinus opens into the right atrium, between the inferior vena cava and the atrio-ventricular orifice. It returns the blood from the substance of the heart, and is protected by a semicircular fold of the lining membrane of the auricle, the coronary valve (the valve of Thebesius). The sinus, before entering the auricle, 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 coronary vein is somewhat constricted and furnished with a valve consisting of two unequal segments.(Gray 462)

Location: It is located in the right atrium and runs transversely in the groove between the left atrium and ventricle on the posterior surface of the heart.

The coronary sinus orifice (opening) is just superior to the septal leaflet of the tricuspid valve. The coronary sinus orifice is also known as the ostium of the coronary sinus, and is guarded by the Thebesian valve.

Drainage: It 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. The anterior cardiac veins drain directly into the right atrium. (Some small veins drain into any of the four chambers of the heart.)

It drains into the right atrium on the posterior, inferior surface, medial to the inferior vena cava opening.