冠状血管是心脏本身的血液供应系统，包括冠状动脉和冠状静脉。冠状血管如花冠状缠绕心脏。

冠状动脉属于动脉，在半月瓣附近从主动脉分支出来，并分为左冠状动脉（A. coronaria sinistra）和右冠状动脉（A. coronaria dextra）。

左冠状动脉在其分支处 1 cm后分出旋支（Ramus circumflexus,RC)）和前室间支（Ramus interventricularis anterior, RIVA）。后者在左右心室(Ventrikel dexter/senister)间延伸至心尖。分支之前被称为主干(Truncus communis)。左冠状动脉保证心脏前壁和侧壁的血供。

The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart (where it is found between the two venae cavae); however, the sinus venosus persists in the adult. In the adult, it is incorporated into the wall of the right atrium to form a smooth part called the sinus venarum, also known as the venarum sinus, which is separated from the rest of the atrium by a ridge of fibres called the crista terminalis. The sinus venosus also forms the SA node and the coronary sinus.