Figure 2225

Photomicrographs of a human placenta, a. This H&E-stained specimen shows the amniotic surface (A), the chorionic plate (CP), and, below, the various-sized profiles of the chorionic villi (CV). These villi emerge from the chorionic plate as large stem villi and branch into the increasingly smaller villi. Blood vessels (BV) are evident in the larger villi. The smallest villi contain capillaries where exchange takes place. x60. Upper inset. This higher magnification shows the simple cuboidal epithelium of the amnion and the underlying connective tissue. x200. Lower inset. This higher magnification shows a cross-sectioned villus containing several larger blood vessels and its thin surface syncytiotrophoblast layer. x200. b. This H&E-stained specimen shows the maternal side of the placenta. The stratum basale (SB), the part of the uterus to which some of the chorionic villi (CV) anchor, is seen at the bottom of the micrograph. Also evident is a stromal connective tissue (CT) component, part of the stratum basale, to which many of the chorionic villi are also attached. Within the stratum basale and the connective tissue stroma are clusters of cells, the decidual cells (arrows), which arose from connective tissue cells. x60. Inset. Decidual cells seen at higher magnification. x200.

decidua parietalis uterine cavity amnion chorion decidua parietalis uterine cavity amnion chorion

placenta decidua basalis placenta decidua basalis

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