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Extended crossing fibers of the mentalis muscle attaching to the contralateral mandible
Joe Iwanaga,Mi-Sun Hur,Shogo Kikuta,Soichiro Ibaragi,R. Shane Tubbs 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.4
Fibers of the facial muscles occasionally extend, cross the midline, and connect to surrounding structures on the contralateral side, perhaps enabling the mouth to make more delicate movements and generate more facial expressions. This case report describes a variant in which the extended fibers of the mentalis crossed the midline and indicates the relationship of these fibers to the surrounding structures. Some of the deepest fibers of the mentalis descended inferomedially and crossed transversely just below the chin prominence to attach to the periosteum of the mandible on the contralateral side. The variation presented in this study shed light on the interactions of the mentalis with the surrounding muscles.
The notch of the mandible: what do different fields call it?
Norio Kitagawa,Keiko Fukino,Yuki Matsushita,Soichiro Ibaragi,R. Shane Tubbs,Joe Iwanaga 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.3
The bony notch on the inferior border of the mandible, anterior to the attachment of the masseter muscle, wherethe facial vessels commonly pass, has been called different names in the literature, e.g., premasseteric notch, antegonial notch,and notch for the facial vessels. Interestingly, various disciplines have leaned toward different names for this notch. Therefore, to aid in consistent communication among professionals, the present study aimed to analyze usage of these varied terms and make recommendations for the best terminology. Based on the adjacent anatomical structures used to name this notch, three groups were analyzed in this study, a group using masseter in the term, a group using gonion in the term, and a group using facial vessels in the term. A literature search found that the group using gonion in the term was found most in the literature. The orthodontics field used gonion in the term the most (29.0%: 31/107) followed by the oral and maxillofacial surgery field (14.0%: 15/107), the plastic surgery field (4.7%: 5/107), and the anatomy field (3.7%: 4/107). The dental field used gonion in this term the most (43.9%: 47/107) and the medical field used facial vessels in the term the most (33.3%: 6/18). Based on these results, the use of gonial terms for this notch seems to be preferred.
Localizing the nerve to the mylohyoid using the mylohyoid triangle
Joe Iwanaga,Hee-Jin Kim,Grzegorz Wysiadecki,Kyoichi Obata,Yosuke Harazono,Soichiro Ibaragi,R. Shane Tubbs 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.3
The nerve to the mylohyoid muscle has been well studied but there are no specific anatomical landmarks for identifying it. Therefore, we aimed to identify anatomical landmarks for localizing the nerve to the mylohyoid muscle in the submandibular region. Sixteen sides from eight embalmed Caucasian cadaveric heads were used in this study. The mean age at the time of death of the specimens was 80.3 years. The anterior and posterior bellies of the digastric muscle, submental artery, and mylohyoid muscle were dissected to verify their relationships with the nerve to the mylohyoid muscle. The nerve to the mylohyoid muscle was found medial to the submental artery, lateral to the anterior belly of the digastric muscle, and anterior to the posterior border of the mylohyoid muscle on all sides. Herein, we identified what we term the mylohyoid triangle. This anatomical region can help localize the nerve to the mylohyoid muscle.