CHRONIC SUPURATIVE OTITIS MEDIA
, Middle Ear Anatomy
The middle ear is an air-filled chamber imagined as a six-sided box, with the posterior
wall wider than the anterior wall to form a wedge-like box.
Figure 1 Anatomy of the boundaries of the middle ear
Its lateral border, the tympanic membrane, separates it from the outer
ear. The medial boundaries from top to bottom are the horizontal
cermiscircular canal, the facial canal, the oval window, the round window,
and the promontory. The anterior border is connected with the eustachian
tube. Posterior boundary with aditus ad antrum and facial canal pars
verticalis. The superior border or roof of the middle ear cavity is formed by
the tegmen tympani, and the inferior border or floor of the middle ear cavity
is adjacent to the jugular foramen.
There are several buildings that also make up the middle ear:
1. Tympanic membrane
The main and largest part of the tympanic membrane is the pars
tensa, while the upper part of the tympanic membrane is the pars flaccida
(Shrapnell's membrane) which is attached directly to the processus
lateralis malleus area between the two end areas of the tympanic notch of
Rivinus, to the annular area.
, Middle Ear Anatomy
The middle ear is an air-filled chamber imagined as a six-sided box, with the posterior
wall wider than the anterior wall to form a wedge-like box.
Figure 1 Anatomy of the boundaries of the middle ear
Its lateral border, the tympanic membrane, separates it from the outer
ear. The medial boundaries from top to bottom are the horizontal
cermiscircular canal, the facial canal, the oval window, the round window,
and the promontory. The anterior border is connected with the eustachian
tube. Posterior boundary with aditus ad antrum and facial canal pars
verticalis. The superior border or roof of the middle ear cavity is formed by
the tegmen tympani, and the inferior border or floor of the middle ear cavity
is adjacent to the jugular foramen.
There are several buildings that also make up the middle ear:
1. Tympanic membrane
The main and largest part of the tympanic membrane is the pars
tensa, while the upper part of the tympanic membrane is the pars flaccida
(Shrapnell's membrane) which is attached directly to the processus
lateralis malleus area between the two end areas of the tympanic notch of
Rivinus, to the annular area.
