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The cervical canal is generally lined by "endocervical mucosa" which consists of a single layer of mucinous columnar epithelium. However, after menopause, the functional squamocolumnar junction moves into the cervical canal, and hence the distal part of the cervical canal may be lined by stratified squamous epithelium (conforming to a "type 3 transformation zone").
The cervical canal has at least two types of epithelia (lining): the endocervical lining is glandular epithelium that lines the endocervix with a single layer of column-shaped cells; while the ectocervical part of the conduit contains squamous epithelium. [1] Squamous epithelium line the conduit with multiple layers of cells topped with flat cells.
The squamocolumnar junction, where the columnar secretory epithelium of the endocervical canal meets the stratified squamous covering of the ectocervix, is located at the external os before puberty. As estrogen levels rise during puberty, the cervical os opens, exposing the endocervical columnar epithelium onto the ectocervix. This area of ...
Microglandular hyperplasia (MGH) of the cervix is an epithelial (endocervical mucosa) benign abnormality (lesion) associated with gland proliferation. [1] [2] It can terminate in mature squamous metaplasia, and it is suspected reserve cells are involved in this process, perhaps in the form of reserve cell hyperplasia with glandular differentiation.
In regard to the cervix, squamous metaplasia can sometimes be found in the endocervix, as it is composed of simple columnar epithelium, whereas the ectocervix is composed of stratified squamous non-keratinized epithelium. [2]
The earliest microscopic change corresponding to CIN is epithelial dysplasia, or surface lining, of the cervix, which is essentially undetectable by the woman. The majority of these changes occur at the squamocolumnar junction, or transformation zone, an area of unstable cervical epithelium that is prone to abnormal changes. [2]
Histopathology of endocervical polyp: With endocervical epithelium and glands (mucinous columnar linings), edematous stroma and clear congestion. H&E stain. [1] A cervical polyp is a common benign polyp or tumour on the surface of the cervical canal. [2] They can cause irregular menstrual bleeding but often show no symptoms. Treatment consists ...
Nabothian cysts are also incidentally found during MRI imaging. During the healing process of chronic cervicitis, squamous epithelium of ectocervix proliferates and enter the cervical canal (endocervix), covering and obstructing the columnar epithelium of endocervical glands. Thus, retention of mucus in the endocervical glands causes cyst ...