Sinus coronarius, mikroanatomska studija

Abstract

INTRODUCTION: Complete appreciation of the cardiac venous system requires an understanding of its embryological basis, its usual patterns of distribution, and its common variations. AIM: The aim of our study was to improve our understanding of the coronary sinus morphometrical and topographical anatomy. METHODS: The investigations were carried out on 25 human hearts (from 11 male and 14 female persons of mean age 59.5; range: 40 to 75 years). The classic anatomical technique of microdissection (using neurosurgical microinstruments) was performed under the stereoscopic microscope on 10 specimens injected with a 10% formaldehyde solution. The arteries and veins of an additional 15 hearts were injected with methylmethacrylate and immersed in a 40% solution of NaOH for corrosion. Following washing out and drying, the obtained vascular casts were examined and measured. RESULTS: Coronary sinus (CS) extends from the opening of the oblique vein of the left atrium into the great cardiac vein, to its empty orifice into the right atrium. The length of CS varied between 22.4 and 41.4 mm (mean 33.0 ± 6.1 mm). The diameter of CS at its beginning was 5.0 - 9.6 mm (mean 6.6 ± 1.3 mm), and its diameter at its atrial mouth varied from 6.6 - 12.0 mm (mean 8.4 ± 1.6 mm). The CS had varied relationships to the branches of the left or right coronary arteries. It extended superficial and above the artery in 16 (64%) hearts, and close superficial to the artery in 9 (36%) cases. Duplication of the superior vena cava associated with an aberrant left hepatic vein was found in one case. The persistent left superior vena cava, which drained into the right atrium via the enlarged coronary sinus, was formed by the persistence of the left anterior cardinal vein. CONCLUSION: Our study shows that the coronary sinus, created in an early stage of embryological development, is an important collecting vessel receiving the main veins of the heart.