Aditus to mastoid antrum
|Aditus to mastoid antrum|
The medial wall and part of the posterior and anterior walls of the right tympanic cavity, side view.
|Latin||Aditus ad antrum mastoideum|
|TA||Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value).|
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
The aditus to mastoid antrum (otomastoid foramen or entrance or aperture to the mastoid antrum) is a large irregular aperture that 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.
|This anatomy article is a stub. You can help Infogalactic by expanding it.|