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Testis

Testis

P608/0115

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Credit

RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY

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Caption

Testis. Illustration of a single human testis. The testis is the site of sperm formation and also produces androgen, a male sex hormone. The main part of the testis (centre) contains many seminiferous tubules (not seen) where sperm production (spermatogenesis) occurs. These tubules are arranged in lobes that radiate from a central plexus. Sperm then pass to the epididymis (at left and upper centre), a single convoluted tube where they are stored while they mature. During ejaculation, sperm enter the vas deferens duct (upper left) and are ejected out of the penis through the urethra.

Release details

Model release not required. Property release not required.

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