(From the same). The coronary arteries and veins. Those of the heart are also called cardiacs. The first branches which the aorta sends off are the coronary arteries of the heart; and they appear between the aorta and the pulmonary artery, running round the basis of the heart and to the apex, giving branches chiefly to their respective ventricles. They frequently anastomose both at the basis and apex. One of these runs antenorly, the other posteriorly on the heart, and sometimes there are three. They are lost in the substance ox"the muscle.

The coronary veins of the heart follow very nearly the arteries; they rise chiefly from the right auricle, and come out in the angle between the vena cava and the passage into the ventricle; one principal branch runs to the apex; the great trunk, to the other parts. Dr. Hunter says, that the coronary vein of the heart opens into the right auricle, between the orifice of the cava inferior and the passage into the ventricle, and is fur-nished with a semilunar valve, to hinder the blood from flowing back.

The great coronary vein, and the orifice by which it communicates with the right sinus of the heart, were known, it has been said by M. Wolf, to Galen; but Eustachius seems to have been the first who noticed the valve with which this orifice is furnished. Since his time, M. Wolf says anatomical writers have con-stanly spoken of this valve as of a semilunar shape; but he asserts that its figure is oblong and narrow, and that it is a peculiar valve, different from every other in the human body.

The coronary artery of the stomach rises from the coe-liaca, goes first to the left side of that organ, a little beyond the superior orifice, round which it throws branches, and also to every part of the stomach near it: and these branches communicate with those which run along the bottom of the stomach to the pylorus: afterwards it runs on the right side of the superior orifice, along the small curvature of the stomach, almost to the pylorus, where it communicates with the arteria pylorica, and turning towards the small lobe of the liver, it gives off some branches to it: then it advances under the ductus venosus to the left lobe of the liver, in which it is lost near the beginning of the duct just named, having first given off some small branches to the neighbouring parts of the diaphragm and omentum.

The coronary vein of the stomach is sometimes a branch from the vena portae ventralis, or from its principal branches. It sometimes springs from the splenica. The coronaria ventriculiis so called, because it surrounds its upper orifice. It runs along the small arch to the pylorus, and gives out branches to the sides of the stomach.