![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Uterus: cervix
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x
![External os <p>The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.U.22.P01.png)
External os
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x
![Plicae palmatae <p>The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.U.22.P02.png)
Plicae palmatae
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x
![Mucous secretions <p>The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.U.22.P03.png)
Mucous secretions
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x
![Simple columnar epithelium <p>The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.U.22.P04.png)
Simple columnar epithelium
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x
![Stratified squamous moist epithelium <p>The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.U.22.P05.png)
Stratified squamous moist epithelium
The external os is the junction of the epithelium lining the endocervical canal with that lining the ectocervix. (See box in inset for orientation.) The position of the external os migrates with the reproductive status of the female. 40x, 100x