Seminal vesicles

Definition

Seminal vesicles are glandular structures located behind the bladder in males that produce a significant portion of the seminal fluid, which nourishes and helps transport sperm. These vesicles play a vital role in male reproductive physiology by secreting a viscous fluid rich in fructose, proteins, and prostaglandins, essential for sustaining sperm motility and viability during ejaculation.

5 Must Know Facts For Your Next Test

1. The seminal vesicles produce approximately 60-70% of the total volume of semen, significantly contributing to its composition.
2. The fluid secreted by the seminal vesicles contains high levels of fructose, which provides energy for sperm cells during their journey through the female reproductive tract.
3. Seminal vesicles are regulated by testosterone and are influenced by other hormones like follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
4. Prostaglandins in the seminal fluid help to stimulate smooth muscle contractions in the female reproductive tract, aiding in the movement of sperm toward the egg.
5. Dysfunction or inflammation of the seminal vesicles can lead to infertility issues or conditions such as seminal vesiculitis.

Review Questions

• How do seminal vesicles contribute to overall male reproductive health?
  • Seminal vesicles play a crucial role in male reproductive health by producing a fluid that nourishes and supports sperm cells. This fluid comprises important nutrients like fructose, which gives sperm energy for motility. Additionally, the secretion from seminal vesicles helps create a medium that facilitates sperm transport during ejaculation, enhancing the chances of successful fertilization.
• Discuss the role of seminal vesicles in semen composition and how it affects sperm function.
  • Seminal vesicles are responsible for producing a major portion of semen, contributing around 60-70% of its volume. The fluid they secrete contains fructose, proteins, and prostaglandins, which together not only nourish sperm but also support their movement through the female reproductive system. Prostaglandins specifically promote contractions in the female tract, aiding sperm transport and improving their chances of reaching the egg for fertilization.
• Evaluate the implications of seminal vesicle dysfunction on fertility and reproductive outcomes.
  • Dysfunction of seminal vesicles can significantly impact fertility by reducing semen quality and volume. Conditions like seminal vesiculitis can lead to pain, inflammation, or blockages that interfere with normal secretion. Consequently, this may result in lower sperm motility or count, ultimately decreasing the likelihood of successful fertilization. Understanding these implications is essential for diagnosing male infertility and developing appropriate treatment strategies.

Related terms

prostate gland:

A gland located below the bladder that contributes additional fluids to semen, helping to enhance sperm mobility and provide a more favorable environment for fertilization.

spermatic cord: A bundle of fibers and tissues that includes blood vessels, nerves, and the vas deferens, connecting the testes to the abdominal cavity and playing an essential role in sperm transport.

ejaculatory duct: The duct formed by the merger of the vas deferens and the seminal vesicle's duct, which carries semen into the urethra during ejaculation.