STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Monkey sperm. Coloured scanning electron micrograph (SEM) of immature monkey sperm in the epididymis. This immature sperm is characterised by a small amount of unshed residual cytoplasm below the head. The epididymis is a 7 metre long coiled tube that lies behind each testis, receiving sperm from them. The sperm mature as they pass slowly through this tube. Magnification: x2500 when printed at 10 centimetres high.
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