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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

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


Source: The Virtual Human Embryo.