Vas deferens

The right and left vas deferens transport the sperm from the epididymis to the urinary tube. Read more here!

Vas deferens

Of the vas deferens (Ductus deferens or Vas deferens) is the excretory duct of the epididymis. In it, the spermatozoa, which are matured and stored in the epididymal duct (ductus epididymidis), are carried on until, together with the secretions of the seminal vesicle and the prostate, they are ejected from the urethral tube during ejaculation. Read everything important about the vas deferens!

What is the vas deferens?

The right and left vas deferens (singular: ductus deferens or vas deferens) are each 50 to 60 centimeters long aisle of about half a centimeter in diameter, which connect the testes / epididymis with the urinary tube. Each vas deferens begins at the lower end of the epididymis, where it is so tightly wound that its length to the mouth is only about 35 centimeters.

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What is the function of the vas deferens?

The ductus deferens is a transport organ. He can aspirate the seeds, which are located in the epididymis (where they are stored for about twelve days) via a suction pump mechanism and then emptied into the urinary tube via a pressure pump mechanism.

This mechanism is made possible by the arrangement of smooth muscle in the wall of the two vas deferens: on the outside lies a longitudinal, in the middle a ring and inside again a longitudinal muscle layer, which are arranged in a spiral system.

Thanks to this strong muscle wall, the diameter of the spermatic duct can be reduced in size in the area where it joins the duct of the seminal vesicle. This reduction in the inner diameter results in the high pressure and high speed with which the seminal fluid during ejaculation in the urinary tube and further outwards.

Where is the vas deferens?

The right vas deferens from the right epididymis, the left ductus deferens from the left epididymis. With its vessels and its shell, the spermatic cord, each vas deferens pulls up the back of the epididymis up to the outer inguinal ring, where it enters the abdominal cavity.

Here, each vas deferens before the bladder to a vial in which the sperm are stored. A little further on, the paired seminal vesicle flows into the vas deferens, which produces the liquid part of the ejaculate. Finally, the two vas deferens cross the prostate gland and open into the urethra. In the further course one speaks then of the urine seed tube.

What problems can the vas deferens cause?

Some men have a congenital malformation of the vas deferens.

Tumors in the scrotum are at a low percentage of spermatic cord tumors, which are usually benign (rhabdomyosarcoma). They occur mainly in childhood and adolescence.

Spermatic sarcomas, on the other hand, are malignant tumors that grow into the surrounding tissue (infiltration) and form secondary tumors (metastases).

A spermatocele is a fluid-filled cavity (cyst), which usually originates from the epididymis, more rarely from the spermatic cord. It arises at the upper testicle pole. Specifically, it is a so-called retention cyst, so a cyst, which is caused by a drainage obstruction. It is filled with sperm and, if it gets bigger than a pinhead, can lead to a feeling of pressure.

External injuries may cause bleeding, bruising or abscess (encapsulated pus) in the area of ​​the ductus deferens.

As part of a prostate infection (prostatitis) or urinary tract infection may also be the paired vas deferens ignite.


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