Scanning electron microscopy on rabbit blastocyst and endometrium during implantation stages

Abstract

The study was conducted to elucidate the interrelationship between the blastocyst and endometrium at early stage of implantation. Japanese White does were autopsied at 7 and 8 days post coitum. The samples were prepared with the method described by us eleswhere, and observed by use of Scanning electron microscopy. The results were as follows. 1. The inner part of the trophoblast was smoothly at 7 days post coitum, and the cellular bolders of the trophoblast was covered yet an abundance of microvilli. The endometrium richly provided round shaped cells with short microvilli. A small number of ciliated cells could be found at the antimesometrial surface of the uterus. 2. The blastocyst at 8 days post coitum contacted loosely with the endometrium antimesometrial portion. The surface of endometrium at this stage contained the characteristic microvilli which formed like a flower structure by the bundle of microvilli.