What is Cervical canal?
{{Infobox anatomy | Name = Cervical canal | synonym = Canal of the cervix, endocervical canal, cervical canal of uterus, cavity of cervix | Latin = canalis cervicis uteri | Image = Gray1167.svg | Caption = Posterior half of [[uterus]] and upper part of [[vagina]] | Image2 = Illu icd o codes.jpg | Caption2 = | System = | Precursor = }} The '''cervical canal''' is the flattened canal going through the [[cervix]]. The cervix is the lower part of the uterus. ==Anatomy== The cervical canal is a tube that connects with the [[uterine cavity]] through the '''internal os''' with the [[vagina]] through the '''external os'''. The internal os is smaller than the external os. The external os is a small, circular opening on the rounded end of the [[cervix]]. The external os opens into the vagina. The cervical cavity is located at the top of the vagina. The external os is surrounded by two lips, an anterior lip and a posterior lip. The anterior lip is shorter and thicker. Both lips are touching the vaginal wall. Before pregnancy, the external os has a rounded shape. After pregnancy the os changes shape. {{Multiple image|total_width=450 |image1= Cervix Normal Squamocolumnar Junction (565238127).jpg |caption1= The squamocolumnar junction of the cervix: The ectocervix, with its stratified squamous epithelium, is visible on the left. Simple mucinous columnar epithelium, typical of the endocervix, is visible on the right. A layer of [[connective tissue]] is visible under both types of epithelium. |image2= Transformation zone types.png |caption2= Transformation zone types:<ref>International Federation for Cervical Pathology and Colposcopy (IFCPC) classification. References:<br>-{{cite web|url=https://www.rcpa.edu.au/Library/Practising-Pathology/Structured-Pathology-Reporting-of-Cancer/Docs/Transformation_zone|title=Transformation zone (TZ) and cervical excision types|website=[[:en:Royal College of Pathologists of Australasia|Royal College of Pathologists of Australasia]]}}<br>- {{cite jour