The Sex Organs - The Male Sex Organs

The Internal Sex Organs: Accessory Organs

The Seminal Vesicles
The seminal vesicles are two sacs which lie next to the ampullae (the enlarged endings of the vasa deferentia) behind the bladder and near the top of the prostate gland. It was formerly believed that the seminal vesicles just served as storage space for accumulated sperm. However, today the opinion prevails that their main function is to provide a fluid which, together with that of the prostate gland, activates the vigorous movement of the sperm cells after ejaculation.