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Enlarged part of the preceding section

An enlarged part of the preceding section reveals branched villi on the entire external surface of the chorion. The cytotrophoblast at the tips of the villi is in process of forming a continuous zone (Cyto.) around the embryo. Section 428.

Fig. 17. Heuser et al., 1945.

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Keywords: chorion, chorionic villi, cytotrophoblast, embryo

Source: The Virtual Human Embryo.