siemenjohtimen

Siemenjohtimen is a Finnish term that translates to "vas deferens" in English. It refers to a vital part of the male reproductive system. The vas deferens is a muscular tube that transports mature sperm from the epididymis, which is located behind the testis, to the ejaculatory ducts. From there, the sperm continues its journey through the urethra and out of the body during ejaculation.

There are typically two vas deferens, one for each testis. These tubes are about 30 centimeters long and are part of the spermatic cord, which also contains blood vessels, nerves, and lymphatic vessels. The muscular walls of the vas deferens contract rhythmically to propel the sperm forward. This process is essential for male fertility, as it ensures the delivery of sperm for fertilization.

In some cases, the vas deferens can be surgically cut or blocked as a form of permanent contraception for men, a procedure known as a vasectomy. This prevents sperm from mixing with semen during ejaculation, thereby preventing pregnancy. Conditions affecting the vas deferens can lead to infertility and may require medical intervention.