The retromolar fossa is an irregular shallow fossa and it is distally located towards the last molar. It is confined via:
- The lowest part of the temporal crest – medially.
- Via the external oblique ridge – laterally.
The retromolar triangle is a three-sided zone which is located posterior/distal towards the third molar tooth, where the retromolar fossa is located in the centre. The buccinator muscle, which is a sack-like muscle of cheek, has its posterior-most fibers inserted on a slight rim of bone known as the buccinator crest inside retromolar triangle.