munanjohtimien

Munanjohtimet, also known as fallopian tubes or oviducts, are a crucial part of the female reproductive system. These are two thin, muscular tubes that extend from the uterus to the ovaries. Their primary function is to transport eggs from the ovaries to the uterus and to provide the site for fertilization.

Each munanjohtim extends approximately 10 to 13 centimeters in length and is about half a centimeter in diameter. The end of the tube closest to the ovary flares out into a funnel-shaped structure called the infundibulum, which is fringed with finger-like projections called fimbriae. These fimbriae sweep over the surface of the ovary and help to capture the egg released during ovulation.

Once an egg is released from the ovary, it enters the infundibulum and is then propelled along the length of the munanjohtim by the action of cilia, small hair-like structures that line the tube, and by muscular contractions of the tube's wall. Fertilization typically occurs within the ampulla, a wider section of the munanjohtim. If fertilization takes place, the resulting zygote begins to divide and is transported to the uterus for implantation.

Munanjohtimet are susceptible to various medical conditions, including infections, inflammation, and blockages, which can impair fertility. Conditions like pelvic inflammatory disease (PID) can scar and damage the tubes, making it difficult for eggs to pass through or for sperm to reach the egg. Ectopic pregnancies, where a fertilized egg implants outside the uterus, often occur within the munanjohtim.