Development of Some Organs Derived from the Three Embryonic Germ Layer in a Degus Ectopic Pregnancy and Presence of a Cytotrophoblast That Mimics Human Chorionic Placenta
Figure 5
Chorionic villous-like structures observed in the vicinity of the bigger mass. (a) The bigger mass (BM) was found in relation to a number of chorionic villi (arrow) that at higher magnification resemble the human placenta. (b) High magnification of the chorionic villi showed in (a). These villi display a human placental appearance rather than degus. In fact, each villus has a central core of loose connective tissue surrounded by a double layer of trophoblast, an outer syncytiotrophoblast and an inner cytotrophoblast. Fetal placental capillaries in the central core are clearly observed. (c) Spatial relation of the bigger mass (BM) with another group of chorionic villi (CV) with the same human placental appearance as shown in (a and b). (d) Higher magnification of the chorionic villi (arrow) observed in (c) showing the presence of two inner cytotrophoblasts (arrows). H/E staining. Calibration bars: (a) = 245 μm; (b) = 1225 μm; (c) = 245 μm; (d) = 600 μm.
