A nabothian cyst is a very fancy word for a very simple, normal, benign mucous filled gland in the cervix. The cervix has two different types of cells that line the surface of it. From the vagina up over the outer part of the cervix (the exocervix), there is a skin lining. These cells are called squamous cells.
The cervical canal that enters into the cavity of the uterus is lined by glandular cells. these glandular cells initially line the outside of the cervix as well. Through a woman's life the exocervical glandular lining is replaced by squamous cells. Commonly a few glands remain under the skin or squamous lining. these glands produce mucous and make these nabothian cysts.