Mature sperm are stored in the epididymis
The epididymis, ductus deferens or vas deferensand ejaculatory ducts form the epicidymis canal. Each epididymis has three regions, called, respectively, the head, body, and mature sperm are stored in the epididymis. Previous page Next page. From the ampulla, seminal fluid is propelled forward through the ejaculatory ducts toward the urethra, passing first by the prostate gland, where a milky fluid is added to form semen. The prostate is composed of compound tubuloalveolar glands that contributes a slightly alkaline fluid to semen. The principle cells have stereocilia or a brush border.