Aditus to mastoid antrum

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Aditus to mastoid antrum
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The medial wall and part of the posterior and anterior walls of the right tympanic cavity, side view.
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Latin Aditus ad antrum mastoideum
Gray's p.1042

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.

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This article incorporates text from a public domain edition of Gray's Anatomy.

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