Used with permission of Elsevier Health Sciences, Anatomy of Orofacial Structures: A Comprehensive Approach, Richard W. Brand & Donald E. Isselhard., 8th edition, 2019; permission conveyed through Copyright Clearance Center, Inc.

Reference: Brand, R. W., & Isselhard, D. E. (2019). Anatomy of orofacial structures: A comprehensive approach. (8th ed.). St.Louis, Missouri: Elsevier.