Entrance to the mastoid antrum
|Entrance to the mastoid antrum|
|The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view.|
|Coronal section of right temporal bone.|
|Latin||aditus ad antrum mastoideum|
|Gray's||subject #230 1042|
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.
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