Illustration of a section through a human testicle

Illustration of a section through a human testicle

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Credit: FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY.

Caption: Illustration of a section through a single human testis, one of a pair of male sex organs that are the site of production of spermatozoa (spermatogenesis) and androgen, the male sex hormone. The bulk of testes consists of seminiferous tubules, the site of spermatogenesis. These are arranged in testicular lobes that radiate from a central plexus, the rete testis. Spermatozoa pass through the rete testis into the epididymis via 12 small ductuli efferentes (4 visible here). Sperm mature in the epididymis and are stored in its lower part until passing into the vas deferens (far left) during ejaculation.

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Keywords: anatomy, artwork, epididymis, human body, male, reproduction, reproductive system, seminiferous tubule, testis

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