Sigmoid plate

The sigmoid plate is variously described as the thin plate of bone between a high riding 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 mastoid air cells).

The wall of the vein can protrude through a defect into the middle ear, creating a dehiscent jugular bulb.

Head and neck anatomy
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Article Information

rID: 2046
Section: Anatomy
Tags: stub, refs
Synonyms or Alternate Spellings:

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