Sperm production site, SEM

Sperm production site, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Sperm production site. Coloured scanning electron micrograph (SEM) of sectioned seminiferous tubules, the sites of sperm production in the human testes. Each tubule contains a swirl of the tails of forming sperm cells (white/green) at its centre. The tubules are lined with a stratified epithelium containing two types of cell: Sertoli cells, which nourish developing sperm, and spermatogenic cells, from which the sperm cells form in a process known as spermatogenesis. Then, the sperm cells mature into their mobile form in a process known as spermiogenesis. Each testis has about 500 of these tubules that are 30-70cm long. Magnification: x70 when printed 10cm wide.

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Keywords: anatomy, coloured, cross-section, horizontal, human body, male, many, multiple, production, reproduction, reproductive system, section, sectioned, sem, seminiferous tubules, sperm, testis, tubule

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