| 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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Coronal section of right temporal bone
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| Details | |
| Identifiers | |
| Latin | aditus ad antrum mastoideum |
| TA98 | A15.3.02.021 |
| TA2 | 6910 |
| FMA | 56797 |
| Anatomical terminology | |
The aditus to mastoid antrum (otomastoid foramen) is a large, irregular opening[1] upon the posterior wall of the tympanic cavity by which the mastoid antrum (situated posteriorly) communicates with the epitympanic recess of the tympanic cavity (situated anteriorly).[2] The walls of the antrum are lined by mucosa which is continuous with that lining the mastoid cells and tympanic cavity.[3]
The medial wall of the aditus features a ridge created by the underlying facial canal, and a bulge created by the underlying ampulla of the lateral semicircular canal. The short limb of incus is lodged in a shallow fossa upon the posterior wall of the tympanic cavity just inferior to the aditus. The pyramidal eminence is situated inferior to the aditus.[2]
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Neurocranium of the skull
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| Parietal |
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| Temporal |
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| Sphenoid |
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| Ethmoid |
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| Outer ear |
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| Inner ear |
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