Mesotympanum
Updates to Article Attributes
The mesotympanum forms the main compartment of the tympanic cavity and contains most of the important structures of the middle ear, including the majority of the ossicular chain.
Gross anatomy
Location
The mesotympanum is found in the middle ear.
Boundaries
Superiorly it is arbitrarily separated from the epitympanum by an axial plane extending medially from the superior margin of the external acoustic canal towards the lateral wall of the inner ear.
Inferiorly it is arbitrarily separated from the hypotympanum by an axial plane extending between the inferior margin of the external acoustic canal and the cochlear promontory.
Laterally lies the tympanic membrane.
Medially is the lateral wall of the inner ear.
Posteriorly the wall is irregular with several small invaginations, lateral to medial, these are the facial recess, pyramidal eminence, sinus tympani, and round window niche.
Contents
The malleus, incus and stapes, except for the head of the malleus and the body and short process of the incus which lie in the epitympanum.
-<p>The <strong>mesotympanum</strong> forms the main compartment of the <a title="Tympanic cavity" href="/articles/middle-ear">tympanic cavity</a>. </p><h4>Gross anatomy</h4><h5>Location</h5><p>The mesotympanum is found in the middle ear.</p><h5>Boundaries</h5><p>Superiorly it is separated from the <a title="Epitympanic recess" href="/articles/epitympanic-recess">epitympanum</a> by an axial plane extending medially from the superior margin of the <a title="External acoustic canal" href="/articles/external-auditory-canal">external acoustic canal</a>. </p>- +<p>The <strong>mesotympanum</strong> forms the main compartment of the <a href="/articles/middle-ear">tympanic cavity</a> and contains most of the important structures of the middle ear, including the majority of the <a href="/articles/middle-ear-ossicles">ossicular chain</a>. </p><h4>Gross anatomy</h4><h5>Location</h5><p>The mesotympanum is found in the middle ear.</p><h5>Boundaries</h5><p>Superiorly it is arbitrarily separated from the <a href="/articles/epitympanic-recess">epitympanum</a> by an axial plane extending medially from the superior margin of the <a href="/articles/external-auditory-canal">external acoustic canal</a> towards the lateral wall of the <a href="/articles/inner-ear">inner ear</a>.</p><p>Inferiorly it is arbitrarily separated from the <a href="/articles/hypotympanum">hypotympanum</a> by an axial plane extending between the inferior margin of the <a href="/articles/external-auditory-canal">external acoustic canal</a> and the <a href="/articles/cochlear-promontory">cochlear promontory</a>. </p><p>Laterally lies the <a href="/articles/tympanic-membrane">tympanic membrane</a>.</p><p>Medially is the lateral wall of the inner ear.</p><p>Posteriorly the wall is irregular with several small invaginations, lateral to medial, these are the facial recess, pyramidal eminence, sinus tympani, and round window niche. </p><h5>Contents</h5><p>The <a href="/articles/malleus">malleus</a>, <a href="/articles/incus">incus</a> and <a href="/articles/stapes">stapes</a>, except for the head of the malleus and the body and short process of the incus which lie in the epitympanum. </p><p> </p>
References changed:
- 1. Amy F. Juliano, Daniel T. Ginat, Gul Moonis. Imaging Review of the Temporal Bone: Part I. Anatomy and Inflammatory and Neoplastic Processes. (2013) Radiology. 269 (1): 17-33. <a href="https://doi.org/10.1148/radiol.13120733">doi:10.1148/radiol.13120733</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/24062560">Pubmed</a> <span class="ref_v4"></span>
- 1. Amy F. Juliano, Daniel T. Ginat, Gul Moonis. Imaging Review of the Temporal Bone: Part I. Anatomy and Inflammatory and Neoplastic Processes. (2013) Radiology. 269 (1): 17-33. <a href="https://doi.org/10.1148/radiol.13120733">doi:10.1148/radiol.13120733</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/24062560">Pubmed</a> <span class="ref_v4"></span>
- 1.
Sections changed:
- Anatomy
Systems changed:
- Head & Neck
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