Otic capsule
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The otic capsule or osseous (bony) labyrinth refers to the dense bone of the petrous temporal bone that surrounds the membranous labyrinth of the inner ear. It is surrounded by the less dense /and variably pneumatised petrous apex and mastoid part of the temporal bone.
AsFrom 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 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 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 / 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>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><h4>Related pathology</h4><ul><li>- +<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>
- +<li>
- +<a href="/articles/cochlea">cochlea</a>, containing the <a href="/articles/cochlear-duct">cochlear duct</a>
- +</li>
- +<li>
- +<a href="/articles/vestibule-ear">vestibule</a>, containing the <a href="/articles/utricle-ear">utricle</a> and <a href="/articles/saccule-ear">saccule</a>
- +</li>
- +<li>
- +<a href="/articles/semicircular-canals">semicircular canals</a>, containing the semicircular ducts</li>
- +</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>
- +<li>into the <a href="/articles/middle-ear">middle ear cavity</a><ul>
- +<li><a href="/articles/oval-window">oval window</a></li>
- +<li><a href="/articles/round-window">round window</a></li>
- +</ul>
- +</li>
- +<li>into the <a href="/articles/posterior-cranial-fossa">posterior cranial fossa</a><ul>
- +<li><a href="/articles/cochlear-aqueduct">cochlear aqueduct</a></li>
- +<li><a href="/articles/vestibular-aqueduct">vestibular aqueduct</a></li>
- +</ul>
- +</li>
- +</ul><h4>Related pathology</h4><ul><li>
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bony labyrinth
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Synonym.
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