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Message definition (Circulatory system ) ====Coronary circulation==== {{Main|Coronary circulation}} The heart itself is supplied with oxygen and nutrients through a small "loop" of the systemic circulation and derives very little from the blood contained within the four chambers. The coronary circulation system provides a blood supply to the [[myocardium|heart muscle]] itself. The coronary circulation begins near the origin of the aorta by two [[coronary arteries]]: the [[right coronary artery]] and the [[left coronary artery]]. After nourishing the heart muscle, blood returns through the coronary veins into the [[coronary sinus]] and from this one into the right atrium. Backflow of blood through its opening during [[atrial systole]] is prevented by the [[Thebesian valve]]. The [[smallest cardiac veins]] drain directly into the heart chambers.
冠動脈循環
心臓自体は、体循環の小さな "ループ"を通じて酸素と栄養を供給され、4つの部屋の中にある血液からはほとんど栄養を得られない。冠循環は心筋 そのものに血液を供給する。冠動脈循環は、大動脈の起始部付近から右冠動脈 と左冠動脈 の2本の冠動脈 によって始まる。心筋に栄養を与えた後、血液は冠静脈を通って冠静脈洞 に戻り、ここから右心房に入る。心房収縮期 の血液の逆流は、テーベ弁 によって阻止される。最も細い心臓静脈 は直接心室に流れ込む。