배아(Streeter 연령군 XIV)의 1예

Abstract

A human embryo that is thought to belong to age group XIV of Streeter's developmental horizon is described. This embryo was obtained incidentally from the hysterectomy specimen to a 46 years old woman who was operated for uterine leiomyoma. The ovulation age of the embryo was 32 days and the length of that was 6mm.It was serially sectioned in 4,um thickness and reconstructed with the 358 .section slides. This embryo was characterized by indentation of -"the lens vesicle, complete separation of otocyst from skin ectoderm, septum primum and atrioventricular canal of the heart, active angiogenesis in the mesenchymal tissue surrounding the bronchi and the eso- phagus, incomplete primitive intestinal loop of the midgut, small dorsal pancreas, primary branches of the bronchi and prominent mesonephros. From above findings, we conclude that this embryo belongs to age group XIV of Streeter's developmental horizon.