| Aditus to mastoid antrum | |
|---|---|
 The medial wall and part of the posterior and anterior walls of the righttympanic cavity, side view. | |
 Coronal section of righttemporal bone | |
| Details | |
| Identifiers | |
| Latin | aditus ad antrum mastoideum |
| TA98 | A15.3.02.021 |
| TA2 | 6910 |
| FMA | 56797 |
| Anatomical terminology | |
Theaditus to mastoid antrum (otomastoid foramen) is a large, irregular opening[1] upon the posterior wall of thetympanic cavity by which themastoid antrum (situated posteriorly) communicates with theepitympanic recess of the tympanic cavity (situated anteriorly).[2] The walls of the antrum are lined by mucosa which is continuous with that lining themastoid cells and tympanic cavity.[3]
The medial wall of the aditus features a ridge created by the underlyingfacial canal, and a bulge created by the underlyingampulla of thelateral semicircular canal. The short limb ofincus is lodged in a shallow fossa upon the posterior wall of the tympanic cavity just inferior to the aditus. Thepyramidal eminence is situated inferior to the aditus.[2]
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