False-colour SEM of sperm around a human egg

False-colour SEM of sperm around a human egg

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This image is part of the feature Motta: Reproduction

Credit: PROF. P. MOTTA/DEPT. OF ANATOMY/UNIVERSITY "LA SAPIENZA", ROME/SCIENCE PHOTO LIBRARY

Caption: Fertilisation. False-colour scanning electron micrograph of a human egg almost surrounded by spermatozoa (yellow). At the beginning of their trip in the vagina the spermatozoa number about 300 million. The encounter between the egg and the few hundred surviviing spermatozoa occurs in the ampullary region of the Fallopian tube. Only one spermatozoon may fertilise the egg and to do this it must penetrate a thick layer of follicular cells (pink) and the inner membrane known as zona pellucida (not visible here). This penetration is aided by enzymes contained in the spermatozoa's head. Magnification: x485 at 6x7cm size. Magnification: x775 at 4x5 inch size.

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Keywords: anatomy, egg, egg and sperm, egg surface, false-coloured, fertilisation, fertilization, follicular cell, human, human body, reproduction, sperm, spermatozoa

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