buccinator

/B UW0 CH IY0 N EY0 T ER0/
noun
  1. 1

    A thin broad muscle forming the wall of the cheek.

    โ€œUntil now there has been no definitive anatomical study describing the area where the parotid duct enters the buccinator muscle.โ€

Source: https://en.wiktionary.org/wiki/buccinator