DR YORGOS NIKAS / SCIENCE PHOTO LIBRARY DR YORGOS NIKAS / SCIENCE PHOTO LIBRARY
Fertilisation. Coloured scanning electron micro- graph (SEM) of a single sperm on the surface of a human egg (ovum) during fertilisation. The egg has a furry surface (blue). The sperm (coloured pink) is attempting to penetrate the egg whose surface attracts the sperm and enables it to attach. The sperm has a rounded head, neck, and a long tail. The sperm head contains enzymes which help it to penetrate the egg. The human female usually produces a single large egg, and only one of the millions of male sperm released may penetrate the egg to fuse with the egg nucleus. Once fertilised, the egg begins its process of growth into a human embryo. Magnification: x7,200 at 6x7cm size. Mag: x22,000 at 9x7".
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