Overall Structure of the Vaginal Portion of the Cervix, Sagittal View

Description

Portio vaginalis cervicis is presented in sagittal section, with the ectocervix (exocervix) projecting inferiorly into the vaginal lumen and the external os (ostium externum uteri) opening directly toward the vagina. Superior to the vaginal fornix, the cervical canal courses cranially within the cervical stroma toward the uterine cavity, while the anterior and posterior cervical lips frame the os on either side. The anterior wall sits closer to the bladder and vesicouterine space, and the posterior aspect faces the rectouterine pouch region, relationships that become obvious in a true midsagittal cut. Sagittal anatomy of the vaginal portion of the cervix matters when you need to localize the squamocolumnar junction and interpret where pathology arises relative to the external os, because the ectocervix is covered by stratified squamous epithelium while the endocervical canal is lined by columnar epithelium. This is the map used for colposcopy and for describing transformation zone lesions in cervical intraepithelial neoplasia, as well as for choosing the depth and orientation of excisional procedures such as LEEP or cold-knife conization to clear disease while limiting cervical insufficiency risk. Use this artwork for gynecology and reproductive anatomy teaching, cervical cancer screening modules (Pap test and HPV-related disease), and for atlas plates or patient-facing education that need a clean explanation of how the external os relates to the vagina in sagittal plane. It also fits operative notes and training materials that reference cervical lips, fornices, and canal orientation during dilation and curettage, hysteroscopy, or IUD insertion. Anatomical accuracy verified by SciePro's Medical Advisory Board.