The female reproductive system is a complex system that consists of various organs working together to support reproduction. Each organ plays a crucial role in this process. In the given options, we need to identify the organ that is not a part of the female reproductive system.

Option 1, the Fallopian tube, is an important part of the female reproductive system. It connects the ovaries to the uterus and is responsible for the transportation of eggs from the ovaries to the uterus. Therefore, option 1 is not the correct answer.

Option 2, the cervix, is also a part of the female reproductive system. It is the lower part of the uterus that connects the uterus to the vagina. The cervix plays a role in regulating the flow of menstrual blood and also acts as the opening for sperm entry during sexual intercourse. Therefore, option 2 is not the correct answer.

Option 4, the vagina, is also a part of the female reproductive system. It is a muscular canal that connects the cervix to the external genitalia. The vagina serves as the birth canal during childbirth and also provides a passage for menstrual blood to leave the body. Therefore, option 4 is not the correct answer.

Option 3, the urethra, is not a part