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Central cavity of an 8-cell embryo

TEM of the central cavity (CC) of a stage 2, 8-cell embryo in vitro, 72 hours post-insemination, (original magnification x7,000). Four blastomeres surround the cavity which contains small cytoplasmic fragments, microvilli and cellular debris.

M = mitochondria
V = vacuole

From: Sathananthan et al., 1986

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Keywords: blastomere, eight-cell embryo, microvilli, stage 2 embryo

Source: The Virtual Human Embryo.