DR YORGOS NIKAS, BIOLOGY OF REPRODUCTION / SCIENCE PHOTO LIBRARY DR YORGOS NIKAS, BIOLOGY OF REPRODUCTION / SCIENCE PHOTO LIBRARY
Polar body on an egg. Coloured scanning electron micrograph (SEM) of the surface of a human secondary oocyte (mature egg), with its first polar body. The rounded polar body is seen above centre; the egg surface (lower frame) is covered with hair-like microvilli. Before ovulation the egg cell undergoes meiotic division giving rise to two cells: a secondary oocyte and a polar body. The polar body degenerates and has no function, while the much larger egg develops in preparation for fertilisation. Microvilli may play a role in the communication between cells of the embryo. Magnification: x2,200 at 5x7cm size.
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