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Blebbing absence of the nuclear membrane of a 16-cell embryo

Very high TEM of part of a blastomere of a stage 2, 16-cell embryo in vivo (original magnification x42,000). A well-formed nucleolus (Nl) contains densely packed fibrils next to fibrillo-granular areas. Notice that blebs are absent in the nuclear membrane (arrows).

From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.

Keywords: bleb(s), fibrils, nuclear membrane, sixteen-cell embryo, stage 2 embryo

Source: The Virtual Human Embryo.