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The lingual frenulum is frequently referred to as a \u201ccord\u201d or \u201csubmucosal band\u201d of connective tissue, yet there is no evidence to support this anatomical construct. This paper aims to describe the anatomy of the in\u2010situ lingual frenulum and its relationship to floor of mouth structures. Fresh tissue microdissection of the lingual frenulum and floor of mouth was performed on nine adult cadavers with photo\u2010documentation and description of findings. The lingual frenulum is a dynamic structure, formed by a midline fold in a layer of fascia that inserts around the inner arc of the mandible, forming a diaphragm\u2010like structure across the floor of mouth. This fascia is located immediately beneath the oral mucosa, fusing centrally with the connective tissue on the tongue's ventral surface. The sublingual glands and submandibular ducts are enveloped by the fascial layer and anterior genioglossus fibers are suspended beneath it. Lingual nerve branches are located superficially on the ventral surface of the tongue, immediately deep to the fascia. The lingual frenulum is not a discrete midline structure. It is formed by dynamic elevation of a midline fold in the floor of mouth fascia. With this study, the clinical concept of ankyloglossia and its surgical management warrant revision. Clin. Anat. 32:749\u2013761, 2019. \u00a9 2019 The Authors. Clinical Anatomy published by Wiley Periodicals, Inc. on behalf of American Association of Clinical Anatomists.<\/jats:p>","DOI":"10.1002\/ca.23343","type":"journal-article","created":{"date-parts":[[2019,1,31]],"date-time":"2019-01-31T02:06:14Z","timestamp":1548900374000},"page":"749-761","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":95,"title":["What is a tongue tie? 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