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Cytoplasmic organelles

High power TEM of the cytoplasm of a stage 1b embryo in vitro, 24 hours post-insemination (original magnification x19,700). The section is tangential to the surface of annulate lamellae showing the ring-shaped structure of the pores and their hexagonal arrangement (arrow).

From: Soupart and Strong, 1974. Reproduced with permission of the American Society for Reproductive Medicine.

Keywords: annulate lamellae, cytoplasm, cytoplasmic organelles, stage 1b embryo

Source: The Virtual Human Embryo.