PHOTO INSOLITE REALITE & V. GREMET / SCIENCE PHOTO LIBRARY PHOTO INSOLITE REALITE & V. GREMET / SCIENCE PHOTO LIBRARY
Human sperm. Coloured Scanning Electron Micrograph (SEM) of mature human sperm (also called spermatozoa). Sperm are the motile male sex cells produced in the testis. Each sperm is about 65 micrometers long and broadly divided into a round head (at right), neck and tail regions. The pear-shaped head contains the nucleus and genetic material of the male needed to fertilize the female egg (ovum). The head is joined to the tail by a short neck. The sperm's tail enables it to swim by whiplash movements, an action that propels it to reach the ovum. Magnification: x1700 at 5x7cm size.
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