PROFESSORS P.M. MOTTA & J. VAN BLERKOM / SCIENCE PHOTO LIBRARY PROFESSORS P.M. MOTTA & J. VAN BLERKOM / SCIENCE PHOTO LIBRARY
Ovulation. False-colour scanning electron micrograph of the ovulation process. The egg (pink at centre) has ruptured the external surface of the ovary (brown), known as the germinal epithelium, and has started its journey through the Fallopian tube towards the uterus. The image clearly shows the thick glycoprotein layer (pink), the zona pellucida, which entirely surrounds the egg. The egg is also partly surrounded by cells (granulosa cells) and fluid (liquor folliculi), seen here in white and turquoise, which formerly provided nutrients and protection to the egg in the ovary. Magnification: x177 at 6x7cm size. Magnification: x255 at 4x5 inch size.
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