SEM of a stage 4 embryo in vitro attached to a monolayer culture of endometrial cells. Notice the numerous microvilli on the surface of the mural trophoblast.
From: Lindenberg, 1991. Reproduced with permission of the publisher, Elsevier.
Keywords: endometrial cells, microvilli, mural trophoblast, stage 4 embryo
Source: The Virtual Human Embryo.