Contribution of the study of the blood supply of the sinus node of donkeys

Abstract

The arterial blood supply of the sinus node has been studied in 30 donkeys: 15 males and 15 females. It was observed that the sinus node was nourished exclusively by the ramus proximaiis atrii sinistri in 21 (70.0% ± 8.3) of the examined hearts; by the ramus proximalis atrii sinistri and ramus intermedius atrii dextri in 4 (13.3% ± 6.2) of the examined pieces; by the ramus proximalis atrii sinistri and ramus distalis atrii dextri in 3 (10.0% ± 5.4) of the examined organs; by the ramus proximalis atrii dextri in 2 (6.7% ± 4.5) of the examined cases. Furthermore, it was not evident the presence of anastomosis between the implied vessels in the arterial blood supply of the sinus node. Finally there was no sexual
influence in the pattern of the blood supply to the sinus node.