Brno, 58, 1989: 175 -184.Absence of the initial trunk of the left coronary artery was incidentAlly observed during a routine dissection of a bovine heart specimen from a 2 -3-year-old steer at slaughter. The coronary arterial circulation was studied subsequently in detail and found to arise from a common trunk for both coronary arteries. Both its origin from the aortA and position in its initial course correspond to those for the right coronary artery. The origin and initial portion of a left coronary artery was not detected macroscopically but instead was represented by a continuation of this thickened initial segment adjacent to the conus trunci pulmonalis. The latter is regularly a connection between the right coronary artery and the ramus interventricularis paraconalis of the left coronary artery as found in the normally developed coronary circulation of bovine. Comment is presented regarding the possible genesis of this anomaly. Cattle, absence, left coronary artery, anomaly
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