There are two seminal vesicles which are situated symmetrically either side of the bladder. The seminal vesicles produce a secretion that contain substances to help provide nourishment to the spermatozoa, and the contraction of the walls of this gland during ejaculation expels this fluid into the ejaculatory ducts forcing the spermatozoa out of the urethra.
Follow this link for further information on the male urogenital system.
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