Editing Testicle (section)

====Duct system====
The testes are covered by a tough fibrous shell called the [[Tunica albuginea of testis|tunica albuginea]].<ref name="Cho">{{Cite book|last1=Cho|first1=S|last2=Bae|first2=J.H.|title=Clinical Regenerative Medicine in Urology|chapter=Penis and Testis|chapter-url=https://books.google.com/books?id=J9s1DwAAQBAJ&pg=PA281|date=2017|publisher=Springer|isbn=978-9-81-102723-9|page=281|access-date=2022-06-01|archive-date=2023-06-29|archive-url=https://web.archive.org/web/20230629155730/https://books.google.com/books?id=J9s1DwAAQBAJ&pg=PA281|url-status=live}}</ref> Under the tunica albuginea, the testes contain very fine-coiled tubes called [[seminiferous tubule]]s.<ref name="Cho"/> The tubules are lined with a layer of cells ([[germ cell]]s) that develop from [[puberty]] through old age into [[sperm]] [[cell (biology)|cells]] (also known as [[spermatozoa]] or male [[gamete]]s).<ref name="Cho"/> The developing sperm travel through the seminiferous tubules to the [[rete testis]] located in the [[mediastinum testis]], to the [[efferent ducts]], and then to the [[epididymis]] where newly created sperm cells mature ([[spermatogenesis]]).<ref name="Pocock">{{Cite book|last1=Pocock|first1=Gillian|last2=Richards|first2=Christopher D.|last3=Richards|first3=David A.|title=Human Physiology|date=2018|publisher=Oxford University Press|isbn=978-0-19-873722-3|page=766|url=https://books.google.com/books?id=NcQ9DwAAQBAJ&pg=PA766|access-date=2022-06-02|archive-date=2023-06-29|archive-url=https://web.archive.org/web/20230629155730/https://books.google.com/books?id=NcQ9DwAAQBAJ&pg=PA766|url-status=live}}</ref> The sperm move into the [[vas deferens]], and are eventually expelled through the [[urethra]] and out of the [[External urethral orifice (male)|urethral orifice]] through muscular contractions.<ref name="Pocock"/>