Otic capsule
Disclosures
- updated 3 May 2023:
- Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)
Updates to Article Attributes
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The otic capsule or or osseous (bony) labyrinth refers refers to the dense bone of the petrous temporal bone that that surrounds the membranous labyrinth of of the inner ear. It is surrounded by the less dense and variably pneumatised petrous apex and mastoid part of the temporal bone.
From anterior to posterior, the osseous labyrinth is comprised of:
- cochlea, containing the cochlear duct
- vestibule, containing the utricle and saccule
- semicircular canals, containing the semicircular ducts
It is lined by periosteum. As As the membranous labyrinth is slightly smaller than the osseous labyrinth, the two are separate by perilymph, which does not communicate with the endolymph contained in the membranous labyrinth.
There are 4 openings:
- into the middle ear cavity
- into the posterior cranial fossa
Related pathology
- petrous temporal bone fractures: involvement of the otic capsule is important to recognise due to increased risk of complications
-<p>The <strong>otic capsule</strong> or <strong>osseous (bony) labyrinth</strong> refers to the dense bone of the <a href="/articles/petrous-part-of-temporal-bone">petrous temporal bone</a> that surrounds the <a href="/articles/membranous-labyrinth">membranous labyrinth</a> of the <a href="/articles/inner-ear">inner ear</a>. It is surrounded by the less dense and variably pneumatised <a href="/articles/petrous-apex">petrous apex</a> and <a href="/articles/mastoid-part-of-temporal-bone">mastoid part of the temporal bone</a>.</p><p>From anterior to posterior, the osseous labyrinth is comprised of:</p><ul>- +<p>The <strong>otic capsule</strong> or <strong>osseous (bony) labyrinth</strong> refers to the dense bone of the <a href="/articles/petrous-part-of-temporal-bone">petrous temporal bone</a> that surrounds the <a href="/articles/membranous-labyrinth">membranous labyrinth</a> of the <a href="/articles/inner-ear">inner ear</a>. It is surrounded by the less dense and variably pneumatised <a href="/articles/petrous-apex">petrous apex</a> and <a href="/articles/mastoid-part-of-temporal-bone">mastoid part of the temporal bone</a>.</p><p>From anterior to posterior, the osseous labyrinth is comprised of:</p><ul>
-<a href="/articles/vestibule-ear">vestibule</a>, containing the <a href="/articles/utricle-ear">utricle</a> and <a href="/articles/saccule-ear">saccule</a>- +<a href="/articles/vestibule-ear">vestibule</a>, containing the <a href="/articles/utricle-ear">utricle</a> and <a href="/articles/saccule-ear-1">saccule</a>
-<a href="/articles/semicircular-canals">semicircular canals</a>, containing the <a title="semicircular ducts" href="/articles/semicircular-ducts">semicircular ducts</a>- +<a href="/articles/semicircular-canals">semicircular canals</a>, containing the <a title="semicircular ducts" href="/articles/semicircular-duct">semicircular ducts</a>
-</ul><p>It is lined by periosteum. As the membranous labyrinth is slightly smaller than the osseous labyrinth, the two are separate by <a href="/articles/perilymph">perilymph</a>, which does not communicate with the <a href="/articles/endolymph">endolymph</a> contained in the membranous labyrinth.</p><p>There are 4 openings:</p><ul>- +</ul><p>It is lined by periosteum. As the membranous labyrinth is slightly smaller than the osseous labyrinth, the two are separate by <a href="/articles/perilymph">perilymph</a>, which does not communicate with the <a href="/articles/endolymph">endolymph</a> contained in the membranous labyrinth.</p><p>There are 4 openings:</p><ul>
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Figure 2: ossicles and bony labyrinth
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Image 3 CT (bone window) ( update )
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