Seminal Vesicles: Definition & Function Video

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  • 0:00 Male Reproductive System
  • 0:41 What Are Seminal Vesicles?
  • 2:10 Ejaculation
  • 2:40 Lesson Summary
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Lesson Transcript
Instructor: John Williams
Semen is the fluid produced by the male reproductive system to carry sperm. Seminal vesicles play a major role in the production of semen. This lesson discusses seminal vesicles and their contribution to semen production.

Male Reproductive System

The male reproductive system is primarily responsible for the production of sperm cells, male sex cells, and delivering those cells to the female system in order to produce offspring. This process requires structures to make the sperm cells, such as the testes, tubes to carry the cells, and glands to produce the fluid necessary to transport the cells. This fluid is known as semen and is important in the reproductive process. Seminal vesicles are major contributors to the production of semen. Let's look at the seminal vesicles and discuss what makes them important for reproductive processes.

What Are Seminal Vesicles?

Seminal vesicles are glands that are found behind and beneath the bladder of the male. The bladder is a muscular pouch that holds urine for removal. The bladder is connected to the urethra, which is a tube that releases both urine and semen from the male system. Urine, as mentioned, is released during waste removal and semen during sexual activity. We point this out in order to demonstrate the connectedness between the urinary system and the reproductive system, since they share this particular pathway.

Seminal vesicles are roughly two to three inches in length in the sexually mature male, and this size will be based on the production of androgens, or sex hormones, in the male body. These glands are surrounded by blood vessels, nerve tissue, and connective tissue for protection. Muscle tissue inside of the vesicles provide the pressure needed to release the fluid from the glands.

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