The coronary arteries and myocardial bridges in Zavot-breed cattle.

This study was conducted to determine of the coronary circulation and macroscopic and microscopic properties of myocardial bridge on coronary arteries in Zavot-breed cattle's heart. In this study, 10 hearts, adult Zavot breed cattle, were used. Colored latex was injected into a. coronaria sinistra and a. coronaria dextra to visualize coronary arteries of hearts. The arterial vascularization of the heart was determined to be supplied by a. coronaria sinistra and a. coronaria dextra which originated from the aorta ascendens. Diameter of the a. coronaria sinistra was larger than a. coronaria dextra and its branches had more. It was ascertained that anastomoses among the left and right coronary arteries were found between r. circumflexus sinister and r. circumflexus dexter, left and right r. coni arteriosi and ventricular branches of r. interventricularis paraconalis and a. coronaria dextra. It was investigated that septum interventriculare was supplied by rr. septales originated from r. interventricularis paraconalis and r. interventricularis subsinuosus. The thickness and width of myocardial bridges were determined as 6.39 mm to 30.88 mm and 1.34 mm to 6.25 mm, respectively. Myocardial bridge was not found above r. marginis ventricularis sinistri. It was seen that the muscle fibers in myocardial bridge had single central core and transverse-bands similar to the regular fibers and intercalated discs were also found in connection regions. It was determined that vein was accompanied with to artery in the bridge.