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Figure 9 | Reproductive Biology and Endocrinology

Figure 9

From: Growth and development of the placenta in the capybara (Hydrochaeris hydrochaeris)

Figure 9

Subplacenta of the capybara at the limb bud stage. (A) Cytotrophoblast lines the fetal mesenchyme of the central excavation but also extends (arrows) into the surrounding basal decidua. Note the close proximity of a large maternal vessel. Haematoxylin and eosin. (B) In a similar field immunostaining for vimentin picks out the fetal blood vessels of the subplacenta. (C) Immunostaining for PCNA shows that the cytotrophoblast of the subplacenta is highly proliferative. (D) The cytotrophoblast is multilayered. The syncytiotrophoblast contains vacuoles and sends microvilli into extracellular spaces (asterisks). TEM. (E) Desmosomes (arrowheads) are seen between adjacent cytotrophoblast cells. The surface of the syncytiotrophoblast is folded where it abuts the extracellular space (asterisk). TEM. (F) The syncytiotrophoblast, with its covering of microvilli (arrows), borders the maternal blood spaces. Large extracellular spaces are present. TEM. Bd = basal decidua, cyt = cytotrophoblasts, fm = allantoic or fetal mesoderm, mv = maternal vessel, syn = syncytiotrophoblast. Scale bars = 100 μm (A-B), 40 μm (C), 10 μm (D), 2 μm (E), 5 μm (F).

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