History:
It is named after a Scottish surgeon,
Sir William MacEwen (1864-1924).
Boundaries of this triangle:
It is bounded:
- Superiorly– Suprameatal crest.
- Antero-inferiorly– posterosuperior segment of bony external auditory canal.
- Posteriorly– A tangential line drawn from the posterior canal wall cutting the suprameatal crest.