navelsträng

Navelsträngen, also known as the umbilical cord, is a vital organ that connects a developing fetus to the placenta during pregnancy. It is a flexible, tubular structure containing blood vessels that are responsible for transporting oxygen and nutrients from the mother to the fetus and removing waste products from the fetus back to the mother's circulation.

The umbilical cord typically consists of two umbilical arteries and one umbilical vein, all surrounded by a jelly-like substance called Wharton's jelly. This jelly helps to protect the blood vessels from being compressed or kinked, ensuring a continuous flow of blood. The length and thickness of the umbilical cord can vary among pregnancies, but it is generally about 50-60 centimeters long and 2-3 centimeters in diameter.

After birth, the umbilical cord is no longer needed and is clamped and cut. This leaves a small stump, which will dry out and fall off within a week or two, leaving behind the baby's navel, or belly button. The umbilical cord is a temporary but essential organ that plays a crucial role in fetal development and the continuation of life.