The seminal vesicles are also called vesicular glands or seminal glands and are part of the male reproductive system. They are two glands that open into the prostate to connect with the vas deferens, which becomes the ejaculatory duct. The anterior surface is in contact with the bottom of the bladder, extending from near the termination of the ureter to the base of the prostate. The posterior surface lies on the rectum, from which it is separated by the rectovesical fascia. The upper ends of the two vesicles diverge from each other, and are related to the vas deferens and the endings of the ureters, and are partially covered by peritoneum. The lower ends are pointed, and converge towards the base of the prostate, where each joins the corresponding vas deferens to form the ejaculatory duct. Along the medial border of each vesicle runs the ampulla of the vas deferens.

The seminal glands are involved in sperm formation, producing a fructose-rich fluid, seminal plasma or seminal fluid, which is used to nourish the sperm. The seminal vesicles also store the sperm between each ejaculation. 

The seminal glands are androgen-dependent.