Contribution to the study of the arterial supply of theContribution to the study of the arterial supply of the sinu-atrial node in buffaloes (Bubalus bubalis - Linnaeus, 1758) üaffarabadi ra in buffaloes (Bubalus bubalis - Linnaeus, 1758) jaffarabadi race

Abstract

The arterial blood supply of the sinus node has been studied in 75 hearts of buffaloes (Bubalus bubalis) obtained from 52 adults (35 females and 17 males) and 23 foetuses (16 males and 7 females). The A. observed that the sinus node area was nourished exclusively by the ramus circumflexus of the a. coronaria dextra in 44 cases (58-7 ±5.7) find in 15 cases (20.0% ±4.6) by collaterals of the ramus circumflexus dexter. After a more detailed, studied it was shown that the sinus node was nourished in 50 hearts (66.7% ±5.4) by the ramus proximalis atrii dextri associated 31 times (41,3% ±5. 7) to the ramus intermedius atrii dextri and 19 times (25.3% ± 5.0) to the ramus distalis atrii dextri. From the remaining 9 hearts ( 12.0 ± 3.8) in 7 cases (9.3% ± 3 .4 ) the sinus node received exclusively the ramus proximalis atrii dextri and in 2 cases (2.7% ± 1 .9 ) the ramus distalis atrii dextri. In 15 of the hearts examined (20.0% ± 1/.6) the sinus node receives collaterals of the a. coronaria sinistra associated 11 times (V, .1% ± l , . l ) to collaterals of the ramus circumflexus of the a. coronaria dextra and 4 times (5.3 ± 2 .5 ) to collaterals of the ramus circumflexus dexter, i.e . the ramus proximalis atrii sinistri associated to the ramus intermedius atrii dextri, 7 times (9.3%, ±3.1/) and to the ramus proximalis atrii dextri, in only one case (1.3% ± 1.3). In one of the heart examined' (1.3% ± 1.3) the ramus proximalis atrii sinistri from the a. coronaria sinistra was distributed in the above mentioned area. Anastomosis were observed 269 times between colleterals from the arteries that nourished the sinus node area. There was no sexual influence in the pattern of the blood supply to the sinus node.