►
Ear
►
►
Overview
Outer ear
Middle ear
External acoustic meatus and tympanic membrane
Recessus
epitympanicus, Pars
cupu laris
z Chorda
/ f
/
tympani
/ ' j t
У Й
Cellulae mastoideae
Recessus epitympanicus
M tensor tympani —
Os temporaie, Pars petrosa
N cochleai
Ductus cochlearis
M tensor tympani,
Tendo
Caput m allei,
, Lig mallei superius
Os temporale
Membrana tympanica
Bulbus superior
venae jugularis
Os occipitale
Articulatio
atlantooccipitalis
Tragi
Meatus acusticus extern us
Cartiiago auriculae
Porus acusticus externus
Meatus acusticus externus
cartilagineus
Meatus acusticus externus
Cartiiago auriculae
Atlas
Fig. 683
External acoustic meatus, Meatus acusticus externus;
tympanic cavity, Cavitas tympani, and cochlea, Cochlea;
frontal section;
posterior view.
Anulus
fibrocartilagineus
Umbo membranae
tympanicae
Prominentia
mallearis
Stria
mallearis
Pars
tensa
Plica mallearis posterior
Meatus acusticus
externus,
(Paries posterior)
Pars flaccida*
Plica mallearis
anterior
Fig. 686
Tympanic membrane, Membrana tympanica;
otoscopic image;
lateral view.
* C linical term : SHRAPNELL’s m em brane
** Typically occurring reflection of light
In order to obtain a complete otoscopic overview of the
cutaneous surface of the tympanic membrane, the external
acoustic meatus must be stretched by pulling the auricle
upwards and posteriorly.
To facilitate orientation, the tympanic membrane is usually
divided into four quadrants [I —
IV)
Fig. 685
Tympanic membrane, Membrana tympanica;
quadrant schema;
lateral view.
The longer diameter of the tympanic membrane in the
adult is 10-11 mm, the shorter diameter is approx. 9 mm
The light source characteristically produces a
triangular reflection of light at the umbo in the region
of quadrant II
