![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Semicircular canals
Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x
![Plane of section <p>Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x</p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P01.png)
Plane of section
Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x
![Vestibule <p>Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x</p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P02.png)
Vestibule
Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x
![Utricle <p>Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x</p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P03.png)
Utricle
Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x
![Saccule <p>Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x</p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P04.png)
Saccule
Three membranous semicircular ducts are shown. One is visible at its attachment with the utricle, just beginning to enter its semicircular canal. The second is sectioned at a distance from the utricle, lying in its bony semicircular canal. The third semicircular duct is represented by its ampulla and the enclosed crista ampullaris. 30x
![Semicircular ducts > <p>One semicircular duct (black arrow) is still attached to the utricle, just beginning to enter its semicircular canal. A second duct (red arrow) has already exited from the vestibule and lies in its bony semicircular canal. </p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P05.png)
Semicircular ducts >
One semicircular duct (black arrow) is still attached to the utricle, just beginning to enter its semicircular canal. A second duct (red arrow) has already exited from the vestibule and lies in its bony semicircular canal.
![- Ampulla > <p>The third semicircular duct is represented by its ampulla, where its crista ampullaris is shown. </p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P06.png)
- Ampulla >
The third semicircular duct is represented by its ampulla, where its crista ampullaris is shown.
![- Crista ampullaris <p>The third semicircular duct is represented by its ampulla, where its crista ampullaris is shown. </p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P07.png)
- Crista ampullaris
The third semicircular duct is represented by its ampulla, where its crista ampullaris is shown.
![Cochlea > <p>The cochlea, the auditory portion of the inner ear, is also present.</p>](https://digitalhistology.org/wp-content/uploads/2018/08/O.E.IE_.SC_.02.P08.png)
Cochlea >
The cochlea, the auditory portion of the inner ear, is also present.