Morphological Observations on Distribution of the Coronary Arteries in Shiba Goats and Japanese Corridale Sheep—Blood Supply of the Sinoatrial Node Artery
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Distribution of the coronary arteries of 8 fresh hearts, consisting of 5 Shiba goats and 3 Japanese Corridale sheep, was studied morphologically, by means of postmortem coronary angiography, transparent specimen technique treated with methyl benzoate, and histological examination of intermittent serial sections. Especially concentrated on origin and distribution of the sinoatrial node (SAN) artery, the present investigation was performed in composition with both cases of the 5 goats and 3 sheep.<BR>1. The left circumflex coronary artery of the 4 out of the 5 goats, ran downward obliquely in the left ventricle after running off from the coronary groove at the part of the intermediary groove, and the circumflex arrived at the half point of the subsinusal interventricular groove, and thus it became the subsinusal interventricular branch. In contrast, the circumflex of both the remaining one goat and the 3 sheep ran straight along the coronary groove until the origin of the subsinusal interventricular groove, when the circumflex gave off the descending branch. In the 5 goats, the right coronary artery coming along from the aorta, shortly after having gotten to the coronary groove, ran downward obliquely in the right ventricle, raeched forward to the half point of the subsinusal interventricular groove, and then faded away. In the case of the sheep, the right coronary artery ran along the coronary groove, approached to the origin of the subsinusal groove, and then faded away as well.<BR>2. In 5 Shiba goats, there were 3 atrial branch arteries in the atria of each animal, the 2 arteries of which originated from the left circumflex coronary artery : the proximal (L1) and distal (L2) branches. The remainder came from the right coronary artery (R1). In 3 Japanese Corridale sheep, there were 6 atrial branches in each animal : the proximal (L1), intermediate (L2) and distal (L3) branches arosed from the left circumflex coronary artery, and one branch (L4) was derived from the first branch of the posterior septal artery coming from the subsinusal interventricular branch of the left coronary artery. The others were proximal (RI) and distal (R2) branches, both of which originated from the right coronary artery.<BR>3. In 5 Shiba goats, the SAN artery was composed of R1, which ran through the inside of the SAN. In 3 Japanese Corridale sheep, it was composed of L1. The L1 of two animals ran outside the SAN and one revealed a centrally located artery in the SAN. Subsequently, the disribution of both the coronary arteries and the SAN artery, and the origin of the SAN artery seem to have a variety of features depending on not only kinds of animals but their breeds.
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