Where the histologicial lining of the uterus becomes the lining of the cervix

where the histologicial lining of the uterus becomes the lining of the cervix

The transition from the histological lining of the uterus to the lining of the cervix occurs at the point where the uterine cavity meets the cervical canal. This transition is typically observed at the internal os, which is the opening between the uterine cavity and the cervical canal.

Histologically, the lining of the uterus is composed of endometrial tissue. The endometrium undergoes cyclical changes during the menstrual cycle, including proliferation, secretory changes, and shedding (menstruation). As you move from the uterine cavity through the internal os into the cervical canal, the histological characteristics of the lining change to reflect the unique features of the cervix.

The lining of the cervix is referred to as the cervical epithelium, which is distinct from the endometrial lining of the uterus. The cervix is lined by stratified squamous epithelium, which is designed to withstand the mechanical stresses associated with childbirth and other physiological functions of the cervix.

So, the transition from the histological lining of the uterus to the lining of the cervix occurs at the internal os, reflecting the change from endometrial tissue to cervical epithelium as you move from the uterine cavity into the cervical canal.