Figure 3

Fetal membranes of the tucuxi, Sotalia fluviatilis (A, C-D) and the boto, Inia geoffrensis (B). (A) The inner surface of the amnion (arrow) is lined by simple cuboidal epithelium. The outer mesothelium forms a simple squamous epithelium. H.E. (B) Folds of allanto-amnion with an area of extensive squamous metaplasia H.E. (C) Area of squamous metaplasia found close to the placenta showing macrophages (arrows) within the tissue. H.E. (D) Allantochorion from an area with poorly developed villous trees and short villi. H.E. Scale bars = 50 μm (A, C), 200 μm (B) 500 μm (D).