Epididymis. Coloured scanning electron micrograph (SEM) of a freeze-fractured plane through the coiled tube that is the epididymis. Aggregates of healthy spermatozoa (sperm, pink) fill this tube, a part of the male reproductive system. 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: x1600 at 6x7cm size.
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