Anatomical study of a left single coronary artery with special reference to the various distribution patterns of bilateral coronary arteries

Citation
M. Koizumi et al., Anatomical study of a left single coronary artery with special reference to the various distribution patterns of bilateral coronary arteries, ANN ANATOMY, 182(6), 2000, pp. 549-557
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Experimental Biology
Journal title
ANNALS OF ANATOMY-ANATOMISCHER ANZEIGER
ISSN journal
0940-9602 → ACNP
Volume
182
Issue
6
Year of publication
2000
Pages
549 - 557
Database
ISI
SICI code
0940-9602(200011)182:6<549:ASOALS>2.0.ZU;2-O
Abstract
A left single coronary artery of heart was observed during anatomy practice at Kumamoto University School of Medicine in a 73-year-old female cadaver who died from a thalamic hemorrhage. The left single coronary artery, havin g a single orifice in the left aortic sinus, bifurcated into the anterior i nterventricular (IVa) and circumflex (CIR) arteries. No orifice of the righ t coronary artery was found on the aortic wall. Giving off a branch which t raversed the upper part of the infundibulum to supply the anterior upper re gion of the right ventricle, the IVa descended in the anterior interventric ular sulcus to supply the apex of the heart. The CIR curved leftwards in th e atrioventricular sulcus to reach the posterior surface, after which it co ntinued to emerge again into the anterior surface. The atrial arteries show ed no anomalous distribution pattern and histological observation revealed no pathological abnormality other than a slightly thickened tunica intima. Furthermore, we observed the distribution patterns of bilateral coronary ar teries in 377 hearts dissected during anatomical practice over 13 years at Kanazawa University (1980-1986) and Kumamoto University (1993-1998). Althou gh the reason why only the right coronary artery was absent is left unexpla ined, it was concluded that the left single coronary artery in this study, having the developed left conal and circumflex branches, was an extreme cas e of the left dominant series of coronary arteries. The formation of single coronary arteries can be explained embryologically by the change of flow i n the capillary plexus established on the ventricle wall.