Seminal vesicles

Definition

Seminal vesicles are a pair of glands located behind the bladder in males that produce a significant portion of the seminal fluid, which nourishes and helps transport sperm during ejaculation. These glands contribute approximately 60-70% of the total volume of semen, playing a vital role in male reproductive health and fertility.

5 Must Know Facts For Your Next Test

1. The fluid produced by seminal vesicles contains fructose, which provides energy for sperm cells.
2. Seminal vesicles also secrete prostaglandins, which help to promote smooth muscle contractions in the female reproductive tract to assist sperm transport.
3. The composition and pH of seminal fluid are crucial for protecting sperm from acidity in the female reproductive tract.
4. Disorders affecting seminal vesicles can lead to issues such as infertility or low semen volume.
5. During a vasectomy, the vas deferens is cut, preventing sperm from mixing with seminal fluid, but seminal vesicles continue to produce their secretions.

Review Questions

• What role do seminal vesicles play in male fertility and how do their secretions interact with sperm?
  • Seminal vesicles play a crucial role in male fertility by producing a significant portion of the seminal fluid that nourishes and protects sperm. Their secretions contain fructose, providing energy for sperm motility, as well as prostaglandins that help facilitate contractions in the female reproductive tract. This interaction enhances the chances of sperm reaching the egg during fertilization.
• How do disorders of the seminal vesicles impact overall male reproductive health?
  • Disorders of the seminal vesicles can lead to reduced semen volume or poor-quality seminal fluid, which may significantly impact male reproductive health and fertility. Conditions like inflammation or cysts can disrupt normal secretion processes, resulting in lower sperm counts or decreased mobility. These issues can make it more challenging for couples to conceive, highlighting the importance of these glands in overall fertility.
• Evaluate the significance of the components found in seminal fluid produced by seminal vesicles in relation to sperm function and female physiology.
  • The components found in seminal fluid, particularly those produced by seminal vesicles, are vital for ensuring optimal sperm function and facilitating successful reproduction. Fructose acts as an energy source for sperm, while prostaglandins play a key role in promoting uterine contractions that aid in sperm transport. Additionally, maintaining an appropriate pH balance is crucial for protecting sperm from harmful acidic environments within the female reproductive tract. The combined effects of these factors underscore the essential role that seminal vesicles and their secretions play in enhancing both male fertility and successful conception.

Related terms

prostate gland:

A gland that surrounds the urethra in males, contributing additional fluid to semen and playing a role in sperm motility and overall reproductive function.

spermatozoa:

The male gametes or reproductive cells produced in the testes, which are carried through the male reproductive system and mixed with seminal fluid for ejaculation.

ejaculatory duct: A duct formed by the merger of the vas deferens and the duct from the seminal vesicle, through which semen is expelled during ejaculation.