Coronary Vasculature in Adult Mongrel Dog

Abstract

The principal subdivisions of the canine coronary arteries were studied by injection with eosin. Hearts were collected over a period of time from cadavers of three apparently healthy adult mongrel dogs that died in an accidental mishap in and around Gannavaram. The left coronary artery arose from the left posterior sinus of the aorta. It divided into septal, left descending and left circumflex arteries. The left descending artery descended down the anterior longitudinal groove and continued to the apex as the paraconal interventricular artery. The left circumflex artery reached the posterior part of the heart through the left coronary groove and descended down the posterior longitudinal groove as the subsinuosal interventricular artery which anastomosed with paraconal
interventricular artery and supplied the apex of the heart. The right coronary artery originated from the right sinus of the aorta. It divided into a small pulmonary branch and continued as the right circumflex artery. The myocardium was chiefly supplied by the left coronary artery and there was extensive collaterisation between the coronary arteries.