Muscles of the Lower Lip: Functional Anatomy, Innervation Patterns, and Nerve Injury Prevention
The DAO, mentalis, and platysma muscles are poly-innervated by buccal, MM, and cervical branches, while the DLI is mostly mono-innervated by cervical branches. Isolated MMn injury rarely worsens lower lip position, while injury to cervical branches to the DLI causes abnormal lower lip elevation and can be avoided by more caudal platysma myotomy.
Authors
- Christine F. Johansen (ORCID: https://orcid.org/0000-0003-0207-5754)
- Shai Michael Rozen (ORCID: https://orcid.org/0000-0002-6719-7595)
- Lior Har-Shai
- Sahejbir S. Bhatia (ORCID: https://orcid.org/0009-0004-5173-751X)
Institutions
- The University of Texas Southwestern Medical Center (US)
Publication Details
- Journal
- Plastic & Reconstructive Surgery
- Published
- 2026-01-22
- DOI
- https://doi.org/10.1097/prs.0000000000012836
- Primary Topic
- Facial Rejuvenation and Surgery Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.00