Iwanaga Joe, He Puhan, Fukino Keiko, Hur Mi-Sun, Kim Hee-Jin, Han Aya, Watanabe Koichi, Ibaragi Soichiro, Kitagawa Norio, Tubbs R Shane
Department of Oral and Maxillofacial Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, Louisiana, USA.
Clin Anat. 2023 Jan;36(1):161-169. doi: 10.1002/ca.23973. Epub 2022 Nov 11.
Anatomy of the superior labial frenulum (SLF), at first glance, seems to be well established. However, existing studies on the SLF lack description of the incisivus labii superioris (ILS), which cannot be ignored when discussing the SLF. We believe that thorough understanding of the SLF necessitates the anatomical knowledge of the ILS. This study aimed to elucidate the anatomical relationship between the orbicularis oris (OO), ILS, and SLF. A total of 20 formalin fixed human cadaveric specimens were used for gross anatomical and/or histological observation. For histological observation, all specimens were stained with Masson-trichrome. The SLF was a mucosal fold between the gingival mucosa and alveolar mucosa with connective tissue deep to it. The connective tissue attached to the alveolar bone in the junction between the right and left ILS. Skeletal muscle fibers other than orbicularis oris was found in one specimen, which were considered the ILS. During a frenulectomy, removal of the connective tissue bundle is required to prevent recurrence of the high SLF insertion.
上唇系带（SLF）的解剖结构乍一看似乎已被充分了解。然而，现有的关于SLF的研究缺乏对唇上切牙肌（ILS）的描述，而在讨论SLF时，ILS是不可忽视的。我们认为，要全面了解SLF，就必须掌握ILS的解剖学知识。本研究旨在阐明口轮匝肌（OO）、ILS和SLF之间的解剖关系。总共使用了20个经福尔马林固定的人体尸体标本进行大体解剖和/或组织学观察。对于组织学观察，所有标本均用Masson三色染色法染色。SLF是牙龈黏膜和牙槽黏膜之间的黏膜皱襞，其深部有结缔组织。结缔组织在左右ILS的交界处附着于牙槽骨。在一个标本中发现了除口轮匝肌外的骨骼肌纤维，这些纤维被认为是ILS。在进行系带切除术时，需要切除结缔组织束以防止高附着的SLF复发。
