Blood supply of the sinus node artery in beagle dogs

Abstract

Summary. Postmortem coronary angiography wasperformed in 20 beagles and 15 mongrels, and the origin and distribution of the sinus node arteries (SNAs) were subsequently investigated using soft X-ray radiography, the tissue elearing method, and histological examination. In 19 of 20 beagles, the SNAs consisted of a single atrial branch originating from the right coronary artery, and the distribution pattern of the atrial branch seemed to be uniform. In contrast, the following three different patterns were recognized in the atrial branehes forming the SNAs of mongrels: (1) distribution by two atrial branches, i.e., one originating from the right coronary artery and the other from the left circumflex artery, (2) dual distribution by two atrial branches originating from the right coronary artery, and (3) distribution by a single atrial branch originating from the right coronary artery or from the left circumflex artery. In 26 of the 30 dogs which were histologically examined, the SNAs ran õutside of the sinus node and were not centrally located. In the beagles, the proximal atrial branch from the right coronary artery reached the atrioventricuolar node area and supplied blood to the atrioventricular node together with the arterial branches derived from the anterior septal artery and posterior septal artery. In addition, the arterial branch of the SNAs reached the atrioventricular junction area. These findings should contribute to clinical, pharmacological, and pathological studies of the cardiovascular system, including studies on cardiac arrhythmias in beagles.

Prevalence of anatomic variants in coronary arteries of Japanese Black cattle

“…In pigs, the SNBs are of LCA origin in 0 to 30% of hearts and RCA origin in 70 to 100% [14,54,62]. Similarly, in dogs, the SNBs originate from the RCA at a high rate [28,40,50]. Contrary to the abovementioned animal species, the SNB originates from the LCX at a high rate in horses [8,24].…”

Morphological Study of the Sinus Node and Its Artery in Yak

“…The sinus node artery in many kinds of species has been demonstrated, including human (Verhaeghe and Van Der Hauwaert, 1967; Anderson et al, 1979; DiDio et al, 1995; Kawashima and Sasaki, 2003), camel (Ghazi and Tadjalli, 1996), bovine (James, 1965), horse (Bishop and Cole, 1967), sheep (Yalcin et al, 2004), dog (Izumisawa et al, 1994), and rabbit (James, 1967).…”