CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Human fertilisation. Artwork showing human fertilisation in the female reproductive system. The vagina (bottom), uterus (centre) and fallopian tubes (oviducts, upper left and upper right) are shown in a sectioned view (the left fallopian tube is not sectioned). Within the ovary at upper right, an oocyte (immature female sex cell) is seen developing and being released during ovulation as it matures. At lower centre, spermatozoa (sperm, male sex cells) have been deposited in the vagina during sexual intercourse. They are shown moving into the uterus and fallopian tubes, with one meeting the oocyte (top right). If the two fuse successfully, the egg has been fertilised.
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