Cervix

The cervix is the lower, narrow end of the uterus that opens into the vagina. It is made up of soft tissue and is lined with a mucous membrane. Its primary function is to act as a barrier between the uterus and the vagina, preventing the passage of sperm from the vagina into the uterus. It also helps to regulate the flow of menstrual fluid from the uterus to the vagina. The cervix has two parts: the external os and the internal os. The external os is the opening to the uterus and is located at the top of the vagina. The internal os is the lower opening of the uterus and is located at the top of the cervix. The cervix produces a mucus-like fluid, known as cervical mucus. This fluid helps to keep the vagina moist and lubricated and also helps to protect it from bacterial and viral infections. Cervical mucus also plays an important role in fertility, as it helps to transport sperm from the vagina to the uterus. The cervix is also responsible for controlling the flow of menstrual fluid from the uterus to the vagina. During each menstrual cycle, the cervix gradually opens to allow menstrual fluid to pass through and then closes to prevent the passage of sperm. During pregnancy, the cervix will open up to allow the fetus to pass through during labor and delivery. The cervix is an important part of the female reproductive system and plays a key role in fertility, pregnancy, and overall health.