Suprameatal triangle

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Bone: Suprameatal triangle
Relations of the brain and middle meningeal artery to the surface of the skull. 1. Nasion. 2. Inion. 3. Lambda. 4. Lateral cerebral fissure. 5. Central sulcus. AA. Reid's base line. B. Point for trephining the anterior branch of the middle meningeal artery. C. Suprameatal triangle. D. Sigmoid bend of the transverse sinus. E. Point for trephining over the straight portion of the transverse sinus, exposing dura mater of both cerebrum and cerebellum. Outline of cerebral hemisphere indicated in blue; course of middle meningeal artery in red.
Latin f. suprameatica
Gray's subject #34 140
/ Elsevier

In the temporal bone, between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process is the area called the suprameatal triangle, mastoid fossa, or MacEwen's triangle, through which an instrument may be pushed into the mastoid antrum.
In the adult, the antrum lies approximately 1cm deep to the suprameatal triangle. This is an important landmark when performing a cortical mastoidectomy. The supreameatal triangle lies deep to the cymba conchae. This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. Template:Skull