| Aditus to 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 aditus to mastoid antrum (entrance or aperture to the mastoid antrum), also known as the otomastoid foramen, 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.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
|
|||||||||||||||||||||||||||||||||||||||||||||||