DR TONY BRAIN / SCIENCE PHOTO LIBRARY. DR TONY BRAIN / SCIENCE PHOTO LIBRARY.
False colour transmission electron micrograph of a single human spermatozoon, showing head, neck & tail regions. The head contains the darkly-stained nucleus of the male gamete; the anterior part of the nucleus is enclosed by the acrosome (more darkly stained), which contains enzymes that assist in penetration of follicular cells that surround the ovum during fertilisation. The head is joined to the middle piece of the tail by a short neck, consisting of 9 striated columns that are continous with the 9 bundles of outer dense fibres that extend along the middle piece. Mitochondria are visible along each side of the fibres. Magnification: X 3700 at 35mm size. Original is bw print p624/037.
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