Suprameatal triangle externally represents:
Correct Answer: Mastoid antrum
Description: Suprameatal triangle, also known as MacEwen's triangle, is seen in temporal bone of skull, in norma lateralis view.
It is a small area/depression present posterior and superior to external acoustic meatus.
It forms the lateral wall of mastoid antrum.
It is of importance to surgeons performing cortical mastoidectomy.
Boundaries of Suprameatal triangle:
Superiorly: By supramastoid crest.
Anteriorly: By posterosuperior margin of EAM (external acoustic meatus).
Posteriorly: Vertical tangent to posterior margin of EAM (external acoustic meatus).
Anteroinferiorly: By presence of suprameatal spine.
Key Concept:
Suprameatal triangle, also known as MacEwen's triangle, is seen in temporal bone of skull, in norma lateralis view. It represents mastoid antrum.
Category:
Anatomy
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