Part of the trophoblast from the lateral or equatorial aspect of the embryo, showing a syncytiotrophoblastic vacuole in the process of forming. It does not communicate with the remainder of the lacunar network.
Fig. 33. Hertig and Rock, 1941.
Keywords: embryo, lacunar network, syncytiotrophoblastic vacuole, trophoblast
Source: The Virtual Human Embryo.