Fuente: The Normal Cervix
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Anatomic Landmarks
Normal cervix
Exocervix
External Os
The external opening of the endocervical canal (as see on speculum exam)
The Normal Cervix:
Histology
Exocervix
Original squamous epithelium
+ glycogenated squamous epithelium of vagina
+ non-glycogenated squamous epithelium of vulva
Endocervical Canal
Original squamocolumnar junction
Line of demarcation between original squamous epithelium and original columnar epithelium
Squamocolumnar junction
Cervical Transformation Zone
Original squamocolumnar junction
Squamous metaplasia
Current squamous columnar junction
Squamous metaplasia
Majority of Cervical Cancers and Precursor Lesions Arise In Immature Squamous Metaplasia of the Cervical Transformation Zone