Entrance to the mastoid antrum
- Entrance to the mastoid antrum
Infobox Anatomy
Name = PAGENAME
Latin = aditus ad antrum mastoideum
GraySubject = 230
GrayPage = 1042
Caption = The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view.
Caption2 = Coronal section of right temporal bone.
System =
Precursor =
MeshName =
MeshNumber =
DorlandsPre = a_16
DorlandsSuf = 12113263
The entrance to the antrum is a large irregular aperture, which leads backward from the epitympanic recess into a considerable air space, named the tympanic or mastoid antrum.
The antrum communicates behind and below with the mastoid air cells, which vary considerably in number, size, and form; the antrum and mastoid air cells are lined by mucous membrane, continuous with that lining the tympanic cavity.
On the medial wall of the entrance to the antrum is a rounded eminence, situated above and behind the prominence of the facial canal; it corresponds with the position of the ampullated ends of the superior and lateral semicircular canals.
ee also
* aditus
* mastoid antrum
External links
* [http://anatomy.med.umich.edu/nervous_system/ear_ans.html Description at umich.edu]
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