From the Dental and Oral Medical Center; the Division of Gross and Clinical Anatomy, Department of Anatomy, Kurume University School of Medicine; the Seattle Science Foundation; and the Department of Anatomical Sciences, St. George's University.
Plast Reconstr Surg. 2020 Mar;145(3):524e-529e. doi: 10.1097/PRS.0000000000006558.
The depressor septi nasi is a facial muscle with many different descriptions of its anatomy. Therefore, the aim of this study was to clarify the relationship of the depressor septi nasi, incisivus labii superioris, and surrounding structures.
Twenty sides from 10 fresh-frozen cadaveric heads were used in this study. The depressor septi nasi and incisivus labii superioris were dissected intraorally and extraorally, and the relationship with surrounding structures was observed.
Eighteen of 20 sides had a depressor septi nasi. When present, the depressor septi nasi originated from the orbicularis oris above the central incisor and the medial portion of the inferior part of the incisivus labii superioris and inserted into the base of the medial crus of the major alar cartilage and nasal septum. These three muscles were three-dimensionally fused at the insertion point of the depressor septi nasi. There was no specimen where the depressor septi nasi originated directly from the maxilla. The depressor septi nasi runs obliquely from the nasal septum and the base of the medial crus of the major alar cartilage to the orbicularis oris and inferior part of the incisivus labii superioris.
A better understanding of the depressor septi nasi, incisivus labii superioris, and surrounding structures might be important during various surgical techniques, especially rhinoplasty.
鼻小柱降肌是一种具有多种解剖描述的面部肌肉。因此，本研究旨在阐明鼻小柱降肌、上唇切牙肌和周围结构的关系。
本研究使用了 10 个新鲜冷冻头颅的 20 侧。通过口腔内外解剖，观察鼻小柱降肌和上唇切牙肌与周围结构的关系。
20 侧中有 18 侧存在鼻小柱降肌。当存在时，鼻小柱降肌起自中切牙上方的口轮匝肌和上唇切牙的内下部，插入大翼软骨的内脚和鼻中隔的基部。这三块肌肉在鼻小柱降肌的插入点处三维融合。没有标本显示鼻小柱降肌直接发自上颌骨。鼻小柱降肌从鼻中隔和大翼软骨的内脚基部斜向走行，止于口轮匝肌和上唇切牙的下部。
更好地理解鼻小柱降肌、上唇切牙肌和周围结构，可能对各种外科技术，特别是鼻整形术非常重要。
