Sperm production, SEM

Sperm production, SEM


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Sperm production. Coloured scanning electron micrograph (SEM) of a transverse section across a freeze-fractured seminiferous tubule, the site of sperm production in the human testis. This tubule contains a swirl of the tails (blue) of developing sperm cells at its centre. The tubule is lined with a stratified epithelium containing two types of cell: Sertoli cells (red), which nourish developing sperm, and spermatogenic cells (green), from which the sperm cells form in a process known as spermatogenesis. After this, the sperm cells mature into their mobile form in a process known as spermiogenesis.

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