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Placenta (3 months)

Microimage
The placenta. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

Two almost identical structures are seen. In the middle of each of them you'll see a part of the chorionic cavity lined by the chorionic plate. The small spots of different sizes surrounding it are the chorionic villi. Note that the tissue sample has been folded during preparation. The chorionic plate is normally flat, not folded as in this image.

Published July 20th 2019, updated November 15th 2020.