Lateral wall of mastoid antrum is related to ?: (A) Superficial temporal aery, (B) External auditory canal, (C) Emissary vein, (D) Meningeal aery
Answer is B. MacEwen's triangle or suprameatal triangle overlies the lateral wall of mastoid antrum. It is bounded above by supramastoid crest, anteroinferiorly by posterosuperior margin of external auditory canal and posteriorly by a tangent drawn from zygomatic arch.