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Hypoblast cell

Low power TEM of a hypoblast cell of a stage 3 embryo in vitro, 145-170 hours post-insemination (original magnification x5,000). Extruded material (asterisk) is in the extracellular space and appears to form a basement membrane-like structure lining the epiblast cells.

BC = blastocystic cavity (blastocoele)
BM = basement membrane
E = epiblast cell

From: Lopata et al., 1982. Reproduced with permission of the publisher, John Wiley & Sons.

Keywords: basement membrane, epiblast cell, extracellular space, hypoblast cell

Source: The Virtual Human Embryo.