The buccinator mechanism.
D002610:Cheek / Q000033:anatomy & histology / Q000502:physiology*; D003724:Dental Arch / Q000033:anatomy & histology; D003761:Dental Impression Technique; D005152:Facial Muscles / Q000033:anatomy & histology / Q000502:physiology*; D006801:Humans; D008409:Mastication; D014059:Tongue / Q000033:anatomy & histology