Seminal Vesicles

Definition

The seminal vesicles are a pair of glandular pouches located behind the bladder in the male reproductive system. They contribute a significant portion of the fluid that makes up semen, the liquid that carries sperm during ejaculation.

5 Must Know Facts For Your Next Test

1. The seminal vesicles produce a viscous, alkaline fluid that makes up 50-90% of the volume of semen, providing nutrients and protection for the sperm.
2. The secretions from the seminal vesicles contain fructose, which is a primary energy source for sperm cells.
3. Dysfunction or blockage of the seminal vesicles can lead to infertility by impairing the ability to produce and ejaculate semen properly.
4. The seminal vesicles are sensitive to the male sex hormone testosterone, which is necessary for their proper development and function.
5. Imaging techniques, such as transrectal ultrasound, can be used to evaluate the size and structure of the seminal vesicles for diagnostic purposes.

Review Questions

• Describe the role of the seminal vesicles in the male reproductive system and their contribution to semen production.
  • The seminal vesicles are a pair of glandular pouches that play a crucial role in the male reproductive system. They produce a significant portion of the fluid that makes up semen, the liquid that carries sperm during ejaculation. The seminal vesicle secretions contain fructose, which serves as a primary energy source for sperm cells, as well as other nutrients and protective substances. The seminal vesicles' contribution to semen volume is estimated to be between 50-90%, making them an essential component of the male reproductive process.
• Explain how the structure and function of the seminal vesicles are influenced by the male sex hormone testosterone.
  • The seminal vesicles are sensitive to the male sex hormone testosterone, which is necessary for their proper development and function. Testosterone regulates the size and activity of the seminal vesicles, ensuring they produce the appropriate volume and composition of the fluid that contributes to semen. Disruptions in testosterone levels or signaling can lead to dysfunction or abnormalities in the seminal vesicles, potentially impairing the ability to produce and ejaculate semen properly, which can impact male fertility.
• Discuss the clinical significance of evaluating the seminal vesicles and how this information can be used in the diagnosis and management of reproductive disorders.
  • Assessing the size, structure, and function of the seminal vesicles is clinically important for the diagnosis and management of various reproductive disorders in men. Imaging techniques, such as transrectal ultrasound, can be used to evaluate the seminal vesicles and identify any abnormalities or blockages that may be contributing to infertility or other reproductive issues. This information can help healthcare providers determine the underlying cause of the problem and develop appropriate treatment strategies, such as addressing hormonal imbalances, clearing obstructions, or exploring assisted reproductive technologies. Comprehensive evaluation of the seminal vesicles is a crucial component of a comprehensive male fertility assessment.

Related terms

Prostate Gland: The prostate gland is a walnut-sized exocrine gland located just below the bladder in males. It produces a fluid that is a major component of semen.

Ejaculation: Ejaculation is the forceful discharge of semen from the male reproductive system, typically accompanied by orgasm.

Semen: Semen is the fluid containing sperm and other secretions from the male reproductive organs, including the seminal vesicles, prostate gland, and vas deferens.