| 11. | Through this hormonal disruption, the process of sperm production in the seminiferous tubules is reduced.
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| 12. | It is secreted from the Sertoli cells, located in the seminiferous tubules inside the testes.
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| 13. | This absorption creates a fluid current that moves the immobile sperm from the seminiferous tubules to the epididymis.
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| 14. | The higher levels of these hormones enable spermatogenesis in the seminiferous tubules and sperm maturation in the epididymis.
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| 15. | This is overcome at puberty when cells within seminiferous tubules called Sertoli cells start making their own retinoic acid.
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| 16. | Each lobule contains the seminiferous tubules, extending from the base where they end blindly, towards the apex.
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| 17. | The testicles converge to form the seminiferous tubules, coiled tubes at the top and back of each testicle.
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| 18. | Spermatogonia stem cells in mammals are found between the basal membrane of the seminiferous tubules and the Sertoli cells.
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| 19. | They secrete testis-determining factor, a binding protein which increases the concentration of testosterone inside the seminiferous tubules.
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| 20. | The ampullae are otherwise essentially identical to the seminiferous tubules in higher vertebrates, including the same range of cell types.
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