Fig 1. Localization of immunoglobulin in chorionic villus. Fetal blood enters the placenta by
the umbilical cord spiral arteries and arbors into small arterioles of branching chorionic villi
that are immersed in maternal blood (MB). Panel A shows a cross section of a terminal
chorionic villus showing the continuous layer of multinucleated syncytiotrophoblasts (STB), a
few underlying cytotrophoblasts (CT), and the villous stroma (VS) with fetal vessels (FV) and
the macrophage-like Hofbauer cells (HC). Panel B highlights a segment of this villus where …