Mc Ewan triangle is formed by all except:: (A) Posterosuperior bony canal wall, (B) Temporal line, (C) Floor of bony canal wall, (D) Tangential line drawn to the EAC
Answer is C. McEwans triangle is bounded by temporal line, postero-superior canal wall and a tangential line to the external auditory canal. This triangle segment overlies mastoid antrum. This is an important anatomical landmark in mastoid surgery.