Ultrastructural study of capillary angiogenesis in rat fetal hearts: role of fibroblasts and myocardial clefts

摘要

To determine the course of capillary angiogenesis int eh rat fetal heart, transmisson electron microscopy was used to examine the development of both capillaries and cardiomyocytes. In the 15-day-old embryo, the coronary vessels had spread into the superficial space. In the 16-day- old embryo, the coronary vessels began to enter the myo- cardium. In the 17-day-old embryo, the terminal vascular bed had developed and a marked increase in the population of myocytes was evident.