Figure 10
From: Growth and development of the placenta in the capybara (Hydrochaeris hydrochaeris)
Subplacenta at around 70 (A-E) and 90 (F) days of gestation. (A) Note the syncytiotrophoblast and the presence in the subplacenta of a maternal vessel, which is separated by several layers of cytotrophoblast from a fetal vessel. Haematoxylin and eosin. (B) Cytotrophoblast, mostly single layered, is associated with fetal mesenchyme. On the other side of this layer, syncytiotrophoblast is found. TEM. (C) The syncytiotrophoblast contains spaces that convey a fragmented appearance. TEM. (D) A fetal vessel within the mesenchyme of the subplacenta. TEM. (E) PAS reaction is strong within the syncytiotrophoblast. (F) Immunostaining for PCNA shows that the cytotrophoblast of the subplacenta remains highly proliferative at mid gestation. Inset: negative control (neg). Cyt = cytotrophoblasts, fm = allantoic or fetal mesoderm, fv = fetal vessel, mv = maternal vessel, syn = syncytiotrophoblast. Scale bars = 40 μm (A, E, F), 10 μm (B, D), 5 μm (C).