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Flattened saccules associated with mitochondria in a 4-cell embryo

High power TEM of a section of a blastomere of a stage 2, 4-cell embryo in vivo (original magnification x30,000). Small, flattened saccules (arrows) are closely related to dense mitochondria.

N = nucleus

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

Keywords: four-cell embryo, mitochondria, nucleus, saccule(s)

Source: The Virtual Human Embryo.