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Hatching point

TEM of a hatching stage 3 embryo in vitro showing the hatching point (original magnification x3,500). One plump zona-breaker cell (ZBC) is stretched around (arrow) the zona opening (O).

BC = blastocystic cavity (blastocoele)
F = fragment
TV = trophoblast vesicle
ZP = zona pellucida

From: Sathananthan et al., 2003. Printed from Reproductive Biomedicine Online.

Keywords: blastocystic cavity (blastocoele), hatching point, trophoblast vesicle, zona breaker cells, zona opening, zona pellucida

Source: The Virtual Human Embryo.