The uterine horn, also called the uterotubal junction, is the part of the uterus closest to the Fallopian tube. The egg released by the ovary travels to the uterus through the uterine horn. There are two uterine horns, one on each end of the uterus.
The uterine horn is part of the reproductive system. When the ovary releases an egg for fertilization, this egg travels through the fallopian tube, uterine horn, uterine tube and to the uterus. In the uterus, the egg is implanted in the endometrium where it waits for the sperm to fertilize it. If the egg is fertilized, a baby will develop and birthed after nine months. However, if the egg is not fertilized, the lining of the endometrium is shed off together with the unfertilized egg as menstruation.
The uterine horn attaches one end of the round ligament of uterus and the other end is attached to the mons pubis. This round ligament of uterus holds the uterus at a certain position such that the uterus leans ventrally so that the uterus can expand as the fetus develops. During mid-pregnancy some round ligament pain may be experienced as the baby rapidly develops and the uterus expands accordingly. The round ligament of uterus become long and thin and stretched like rubber consequently causing pain. This pain is quite normal and does not harm the baby. Rest, warm compress, hot bath, and changing position can help relieve the pain if not stop it. A licensed physician should be consulted if pain becomes severe and is accompanied by bleeding, fevers and chills.