Skip Navigation

Section through middle of specimen

Section through the middle of the embryo. The space outlined by the internal surface of the chorion now appears distended again. However, a gradient of differentiating trophoblast from abembryonic to embryonic pole is still evident. Intercommunicating lacunae are visible in the syncytiotrophoblast. The primary umbilical vesicle, surrounded by a meshwork, can be seen. The endometrial stroma is edematous and decidua is developing.

Fig. 13. O'Rahilly and Müller, 1987

Click on the picture to view the full-sized image.

Keywords: abembryonic pole, chorion, embryonic pole, endometrial stroma, intercommunicating lacunae, primary umbilical vesicle, syncytiotrophoblast, trophoblast

Source: The Virtual Human Embryo.