Dear student, Sperms are matured in epididymis. The epididymis is a long, coiled tube that rests on the backside of each testicle. The long length of the epididymis provides storage space for spermatozoa and allows them to mature before release. It also absorbs fluid and additional substances to the seminal fluid to nourish the maturing sperm. The process of maturation of sperms is called spermiogenesis. Regards