Section passing transversely through the gonad of a typical stage 18 embryo showing the initial sexual differentiation of coelomic epithelium of a female. The surface of the gonad is smooth, and there is a distinctly marked-off layer of "germinal epithelium."
O'Rahilly and Müller, 1987.
Keywords: coelomic epithelium, germinal epithelium, glomerulus, gonad
Source: The Virtual Human Embryo.