The ucervix, or uterine cervix, is the lower part of the uterus that forms a canal opening into the vagina. It plays a crucial role in reproductive health, acting as a passage for menstrual fluids, sperm, and, during childbirth, the baby. The cervix also produces mucus that can either facilitate or hinder sperm movement, depending on the menstrual cycle. Additionally, it serves as a protective barrier against infections.