Sigmoid plate

Changed by Francis Deng, 9 Nov 2018

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The sigmoid plate is variously described as the ~~thin~~ plate of bone between the jugular bulb and the middle ear cavity (as shown in first image) or more generally as the thin bone separating the sigmoid sinus from adjacent structures ~~(especailly~~(especially mastoid air cells). In the case of the former, the structure is also referred to more specifically as the jugular wall, jugular floor, or jugular plate ^1,2. In the case of the latter, the structure is also referred to as the sigmoid sinus plate ³.

In the case of a high riding jugular bulb, the plate is thinned. The wall of the vein can even protrude through a defect into the middle ear cavity, creating a dehiscent jugular bulb.

-The sigmoid plate is variously described as the thin plate of bone between a <a href="/articles/high_riding_jugular_bulb">high riding jugular bulb</a> and the <a href="/articles/middle-ear-cavity">middle ear cavity</a> (as shown in first image) or more generally as the thin bone separating the <a href="/articles/sigmoid-sinus">sigmoid sinus</a> from adjacent structures (especailly mastoid air cells).
~~-The wall of the vein can protrude through a defect into the middle ear, creating a <a href="/articles/dehiscent_jugular_bulb">dehiscent jugular bulb</a>.~~
~~-~~
+The sigmoid plate is variously described as the plate of bone between the <a href="/articles/jugular-bulb">jugular bulb</a> and the <a title="Middle ear" href="/articles/middle-ear">middle ear cavity</a> (as shown in first image) or more generally as the thin bone separating the <a href="/articles/sigmoid-sinus">sigmoid sinus</a> from adjacent structures (especially mastoid air cells). In the case of the former, the structure is also referred to more specifically as the jugular wall, jugular floor, or jugular plate 1,2. In the case of the latter, the structure is also referred to as the sigmoid sinus plate 3.In the case of a <a href="/articles/high-riding-jugular-bulb">high riding jugular bulb</a>, the plate is thinned. The wall of the vein can even protrude through a defect into the middle ear cavity, creating a <a href="/articles/dehiscent-jugular-bulb">dehiscent jugular bulb</a>.

References changed:

1. Caldemeyer KS, Mathews VP, Azzarelli B, Smith RR. The jugular foramen: a review of anatomy, masses, and imaging characteristics. (1997) Radiographics : a review publication of the Radiological Society of North America, Inc. 17 (5): 1123-39. <a href="https://doi.org/10.1148/radiographics.17.5.9308106">doi:10.1148/radiographics.17.5.9308106</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/9308106">Pubmed</a>
2. Juliano AF, Ginat DT, Moonis G. 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>
3. Prescher A, Brors D. The various shapes of the paries jugularis and the frequency of additional ducts in the fossa jugularis as further factors influencing the spread of pathological processes. (1995) European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery. 252 (1): 26-9. <a href="https://www.ncbi.nlm.nih.gov/pubmed/7718224">Pubmed</a>
<a href="http://www.amazon.com/gp/product/0865777004?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0865777004" title="http://www.amazon.com/gp/product/0865777004?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0865777004" class="external text" rel="nofollow">JD Swatrz, HR Harnsberger "Imaging of the Temporal Bone" Thieme</a>