Question
| A. |
Hypotympanum |
| B. |
Epitympanum |
| C. |
Attic |
| D. |
Mesotympanum |
|
Correct Answer » D Explanation |
 |
The middle ear (tympanic cavity) is divided into three parts based on its relation to the tympanic membrane:
-
Epitympanum (Attic) – part above the tympanic membrane
-
Mesotympanum – part opposite the tympanic membrane
-
Hypotympanum – part below the tympanic membrane
Narrowest Part of the Middle Ear
The mesotympanum is considered the narrowest portion of the middle ear cavity.
The narrowest point specifically lies:
-
Between the umbo of the tympanic membrane
-
And the promontory on the medial wall
The distance between these structures is about 2 mm, making this the most constricted region of the middle ear.
This narrow space is clinically important because:
-
It contains parts of the ossicular chain (malleus and incus)
-
It is a key area involved in middle ear infections and surgeries.
