The coronary arteries of 16 squirrel monkeys were pre-perfused with acetone and subsequently filled with vinyl acetate. Thirteen of the hearts were then bleached, dehydrated and cleared in cedar oil; three were subjected to corrosion in concentrated hydrochloric acid.

The right coronary artery arises from the right coronary sinus of Valsalva. In 50% of specimens, the “artery of the conus” arises independently from the same sinus by a separate ostium; in the other 50% being a branch of the proximal portion of the right coronary artery. The right coronary distributes vessels supplying the lateral three-fourths of the anterior right ventricle, all of the posterior right ventricle, the posterior one-third of the interventricular septum, the right atrium, the posterior papillary muscles of the right ventricle, the atrioventricular node, the sinus node (in 9 specimens), and the medial one-third of the posterior left ventricle. The left coronary artery, supplying the remainder of the heart, arises in all cases from the left coronary sinus and bifurcates to form the ventrally terminating anterior interventricular coronary artery and the left coronary circumflex. In one specimen, the left coronary artery supplied the atrioventricular node.