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High power LM of section through the fertilization cone

A series of six high power LMs of sections through a stage 1a embryo in vitro showing telophase II of the second polar body, 3 hours post-insemination.

a) Sperm tail (arrow) is evident close to the fertilization cone. The zona pellucida and corona radiata cells are outside the subzonal space. A few tiny vacuoles are in the cytoplasm. (original magnification x740)

From: Lopata et al., 1980. Reproduced with permission of the American Society for Reproductive Medicine.

Keywords: corona radiata cell(s), cytoplasm, fertilization cone, second polar body, sperm tail, stage 1a embryo, subzonal space, telophase II, vacuole(s), zona pellucida

Source: The Virtual Human Embryo.