Seminal vesicles

Definition

Seminal vesicles are a pair of glands that produce and secrete a significant portion of the fluid that becomes semen. They are located behind the bladder and in front of the rectum in males.

5 Must Know Facts For Your Next Test

1. Seminal vesicles contribute about 60-70% of the total volume of semen.
2. The fluid from seminal vesicles contains fructose, which provides energy for sperm cells.
3. Alkaline secretions from seminal vesicles help neutralize the acidic environment of the female reproductive tract.
4. Prostaglandins present in seminal vesicle fluid aid in sperm motility and viability.
5. The secretion from seminal vesicles combines with sperm and other fluids in the ejaculatory ducts before being expelled.

Review Questions

• What percentage of semen volume is contributed by the seminal vesicles?
• Which nutrient found in the fluid secreted by seminal vesicles provides energy for sperm?
• How do alkaline secretions from seminal vesicles benefit sperm cells?

Related terms

Prostate Gland: A gland that produces additional fluid that nourishes and transports sperm.

Ejaculatory Ducts: Tubes through which semen passes during ejaculation, formed by the joining of ducts from seminal vesicles and vas deferens.

Fructose:

A sugar present in the fluid secreted by seminal vesicles, providing energy for sperm cells.