Seminal Vesicles

Definition

The seminal vesicles are a pair of glandular pouches located behind the bladder in the male reproductive system. They produce a viscous, alkaline fluid that makes up a significant portion of the semen, which helps to nourish and transport sperm during ejaculation.

5 Must Know Facts For Your Next Test

1. The seminal vesicles produce approximately 50-70% of the total volume of semen, making them a crucial component of the male reproductive system.
2. The fluid produced by the seminal vesicles contains fructose, which provides energy for the sperm, as well as prostaglandins, which help to regulate smooth muscle contractions during ejaculation.
3. Dysfunction or blockage of the seminal vesicles can lead to conditions such as azoospermia (absence of sperm in the semen) or oligospermia (low sperm count).
4. The seminal vesicles are located just above the prostate gland and behind the bladder, in close proximity to the vas deferens and ejaculatory ducts.
5. Imaging techniques, such as transrectal ultrasound, can be used to assess the size and structure of the seminal vesicles, which may be important in the diagnosis of reproductive disorders.

Review Questions

• Describe the role of the seminal vesicles in the male reproductive system.
  • The seminal vesicles play a crucial role in the male reproductive system by producing a significant portion of the semen, which is the fluid that carries and nourishes sperm during ejaculation. The fluid produced by the seminal vesicles contains fructose, which provides energy for the sperm, as well as prostaglandins, which help to regulate smooth muscle contractions during the ejaculatory process. The seminal vesicles are located just above the prostate gland and behind the bladder, in close proximity to the vas deferens and ejaculatory ducts, allowing for the efficient transfer of their secretions to the semen.
• Explain how dysfunction or blockage of the seminal vesicles can impact male fertility.
  • Dysfunction or blockage of the seminal vesicles can lead to conditions such as azoospermia (absence of sperm in the semen) or oligospermia (low sperm count), which can significantly impair male fertility. This is because the seminal vesicles produce a large portion of the semen, and their secretions are essential for providing energy and proper transport for the sperm. Disruptions in the structure or function of the seminal vesicles can prevent the proper mixing of their fluid with the sperm, leading to reduced sperm motility, viability, and overall reproductive capacity.
• Discuss the importance of imaging techniques in the assessment of seminal vesicle structure and function.
  • Imaging techniques, such as transrectal ultrasound, can be crucial in the assessment of the seminal vesicles and their role in the male reproductive system. These imaging methods allow healthcare providers to evaluate the size, shape, and structure of the seminal vesicles, which may provide important information for the diagnosis and management of reproductive disorders. By examining the seminal vesicles, healthcare professionals can identify potential blockages, abnormalities, or other issues that could be contributing to fertility problems or other reproductive health concerns. This information can then guide the development of appropriate treatment strategies to address any underlying issues with the seminal vesicles and improve overall male reproductive function.

Related terms

Prostate Gland:

The prostate gland is a walnut-sized exocrine gland in the male reproductive system that produces a fluid component of semen, which helps to protect and nourish sperm.

Ejaculation: Ejaculation is the expulsion of semen (containing sperm) from the male reproductive system, usually accompanied by an orgasm.

Vas Deferens:

The vas deferens is the tube that transports sperm from the epididymis to the ejaculatory duct, where it mixes with fluids from the seminal vesicles and prostate gland to form semen.