Seminal Vesicles: Structure, Function, and Importance Quiz

Seminal Vesicles

Seminal vesicles are glands located near the prostate in males, responsible for producing part of the semen called seminal plasma. This fluid plays a crucial role in transporting sperm cells, nourishing them, and supporting their motility after ejaculation. Let's delve deeper into the structure, function, and importance of these fascinating organs.

Structure

The seminal vesicle is composed of two tubular structures connected by a narrow neck, which opens into the vas deferens. It produces a clear, thick yellowish liquid known as seminal plasma or coagulant. This secretion contains fructose and citric acid, which serve as energy sources for early embryonic development. Additionally, it includes prostaglandins that can act as hormones during the reproductive cycle; however, their exact functions remain somewhat unclear.

Function

During sexual intercourse, the male body prepares the seminal vesicles to release their contents through a series of complex processes involving the brain, spinal cord, nerves, muscles, and blood vessels. When a man reaches orgasm, his genitals contract involuntarily, sending signals from the penis along neuronal pathways back up the spinal cord and eventually to the hypothalamus. The brain responds by initiating a cascade of events resulting in contraction of smooth muscle fibers around the seminal vesicles, squeezing out its secretions. As the vesicular fluid mixes with the sperms produced by the testis within the epididymides, they form the ejaculate.

After ejaculation, the fructose and other nutrients in the seminal plasma support the survival and proper functioning of sperm cells. These components also help neutralize any potentially toxic alkalinity in the female reproductive tract. In this manner, seminal vesicles play a vital role in ensuring successful fertilization.

Importance

While seminal vesiculitis - inflammation of the seminal vesicles - may cause severe pain and difficulty urinating due to infection or obstruction, a healthy pair of seminal vesicles is essential for a man's ability to reproduce.

In conclusion, the seminal vesicles are integral parts of the male reproductive system. They produce seminal plasma containing critical elements such as fructose, citric acid, and prostaglandins, all of which contribute to the health and function of sperm. Their contractions during ejaculation propel this enrichment substance alongside the spermatozoa, increasing the chances of successful fertilization.