--- title: Mentalis Muscle slug: mentalis-muscle-b83ce url: /detay/mentalis-muscle-b83ce type: article language: English entity: primary: Mentalis Muscle type: article disambiguation: Mentalis Muscle: Anatomy, function, and clinical significance. Learn about its role in facial expressions and treatments for related conditions. categories: - name: Health And Medicine slug: saglik-ve-tip url: /kategori/saglik-ve-tip tags: - Geniospasm - Botulinum Toxin - Chin Wrinkles - Mentalis - Facial Expressions author: Emin Neşat Gürses created_at: 2025-08-02T13:58:38.240019+03:00 updated_at: 2025-08-17T17:18:38.584940+03:00 --- # Mentalis Muscle ## KURE Information Cards ![PYUdUxbFMVZeeFCoV5txqoxzYjvCex9Y.png](https://cdn.t3pedia.org/media/uploads/2025/08/02/KkIb0ZW1OBLJGrgcM0TbNSEVtYaSJeo0.png) *Mentalis Muscle* | Field | Value | |-------|-------| | Artery | It is supplied by the facial artery. | | Border | It is innervated by the facial nerve (cranial nerve VII). | | Function(s) | It lifts the lower lip up and forward,tightening the chin skin. It creates an expression of thought or concern. | ## Article Content *The Mentalis Muscle* is a small, paired facial muscle located in the center of the lower lip and at the tip of the chin (mentum). It is also known as the "pout muscle" because when contracted, it lifts the lower lip, causing chin wrinkles and a duck-like expression. ### **Anatomy** #### **Morphology and Connection Points** The [Mentalis Muscle](/en/detay/mentalis-kasi-f45e7/llms.txt) originates from the mental process of the mandible (the midline of the jawbone), and its fibers insert into the skin of the chin and the soft tissue of the lower lip. It interacts with the [orbicularis oris muscle](/en/detay/orbicularis-oris-muscle-c2caa/llms.txt) and lies deep to the [depressor labii inferioris muscle](/en/detay/depressor-anguli-oris-muscle-5bc0b/llms.txt). This location enhances the mentalis muscle's influence on the skin of the lower lip and chin. During muscle movements, characteristic dimpling and creases occur in the skin of the chin. ### **Embryological Origin and Classification** The Mentalis Muscle is a member of the facial expression muscles and embryologically originates from the second pharyngeal arch. Functionally, it controls the movement of the lower lip and chin skin, playing a role particularly in lip closure and facial expressions. When classified, it is among the muscles specifically responsible for lip movements and is a key component of the facial expression muscles. ### **Nerve Innervation and Vascular Supply** The Mentalis Muscle receives motor innervation from the marginal mandibular branch of the facial nerve (cranial nerve VII). Blood circulation is provided by branches of the facial artery. The superficial and deep structures of the muscle ensure adequate blood supply and function of the nerves and vessels within the muscle. ### **Function and Clinical Relationships** The Mentalis Muscle is one of the primary muscles that pulls the lower lip upward and inward. This muscle is particularly active in producing expressions of sullenness, suspicion, or displeasure. It also contributes to lip puckering. In cases of lip inadequacy, such as when the lips cannot be fully closed, the mentalis muscle plays a role in providing temporary oral adequacy. The muscle's contraction results in noticeable dimpling and wrinkles in the skin of the chin. Geniospasm (Jaw Tremor Syndrome) is a condition characterized by involuntary, rhythmic contractions of the mentalis muscle, attacks that can last from seconds to hours, and is associated with a genetic predisposition. While botulinum toxin injections are the most effective treatment, medications such as haloperidol and benzodiazepines can also be used for symptom control. Because overactivity of the mentalis muscle can lead to wrinkles in the chin area, Botox injections are widely preferred for aesthetic purposes to eliminate these wrinkles; however, improper dosing can lead to weakness in lip movement. Additionally, hyaluronic acid fillers are used to improve the chin contour and enhance the aesthetic appearance of the mentalis muscle. Ultrasonography, a non-invasive method for assessing muscle structure and function, is an effective imaging tool for both muscle condition and the diagnosis of potential pathologies. ## Academic Sources and References 1. Yi, Kyu-Ho, Ji-Hyun Lee, Hye-Won Hu, and Hyun-Jun Park. “Novel Anatomical Guidelines for Botulinum Neurotoxin Injection in the Mentalis Muscle: A Review.” Toxins 14, no. 6 (2022). Accessed 29 July 2025. https://www.researchgate.net/publication/368600866 .Gobbis, Mara Letícia, Bruno Luis Amoroso Borges, Karina Aparecida Tramonti, and Cynthia Lopes da Silva. “Influence of Mentalis Muscle Relaxation on Oronasal Breathing.” Journal of Clinical Anatomy 33, no. 4 (2020): 492–498. Accessed 29 July 2025. https://www.researchgate.net/publication/349167334 .Choi, Da-Yae, Hyungkyu Bae, Jung-Hee Bae, and Hee-Jin Kim. “Effective Locations for Injecting Botulinum Toxin into the Mentalis Muscle: Cadaveric and Ultrasonographic Study.” Clinical Anatomy 34, no. 1 (2021): 102–110. Accessed 29 July 2025. https://www.researchgate.net/publication/348830854 .Sökmen, Kevser, Tuba Talo Yildirim, and Serkan Dundar. “Effect of Botulinum Toxin-A Injection Applied to the Mentalis Muscle on Free Gingival Graft Operation: A Retrospective Study.” Journal of Periodontal Research 58, no. 2 (2023): 285–292. Accessed 29 July 2025.  https://www.researchgate.net/publication/372513698 .