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As sperm enter the urethra, the seminal vesicles, prostate gland, and Cowper âs glands all secrete fluids into the urethra. 3 5 Sperm, Cont âd 5. These fluids nourish the sperm and protect them from the acidity of the female reproductive tract6. Semen is the mixture of sperm and fluids7. Involuntary contractions of the muscles force the semen through the urethra, and out of the body in a process called ejaculation 6 Seminal Vesicles 1. Active secretory gland2.
About 70-85% of the seminal fluid in humans originates from the seminal vesicles, but is not expelled in the first ejaculate fractions which are dominated by spermatozoa and zinc-rich prostatic fluid. The excretory duct of each seminal gland opens into the corresponding vas deferens as it enters the prostate gland.