Surface Landmarks of Oral Oral Cavity (2)

Retromolar trigone: It is a roughly triangular area behind the last molars representing the posterior aspect of the vestibule.

Pterygomandibular Raphe: It indicates the junction between the buccinator and superior constrictor muscles, and is used as a landmark for administration of intraoral local anesthesia.

retroPosterior oral cavity showing left retromolar trigone (long arrow) and pterygomandibular raphe (short arrows). Local anesthetic for a mandibular nerve block is injected lateral to the raphe, piercing the buccinator muscle (asterisk)