The cervix is the lower, narrow end of the uterus (the organ where a fetus grows). The cervix leads from the uterus to the vagina (birth canal).
The main types of cervical cancer are squamous cell carcinoma and adenocarcinoma. Squamous cell carcinoma begins in the thin, flat cells that line the cervix. Adenocarcinoma begins in cervical cells that make mucus and other fluids.