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In vivo embryo

Light micrograph of a stage 3 embryo in vivo obtained by uterine lavage after a single, peri-ovular insemination. The embryo was then transferred to the recipient uterus of an infertile woman where it resulted in an intrauterine pregnancy and a normal, term infant. A blastocystic cavity (blastocoele) and inner cell mass (embryoblast) are clearly visible.

From: Buster et al., 1985. Reproduced with permission from the publisher, Elsevier.

Keywords: corona radiata cell(s), inner cell mass (embryoblast), trophoblast, zona pellucida

Source: The Virtual Human Embryo.