Hur M S, Hu K S, Park J T, Youn K H, Kim H J
Department of Anatomy, Kwandong University College of Medicine, Room 503, Kwandong University College of Medicine, Naegok-Dong 522, Gangneung 210-701, Korea.
Surg Radiol Anat. 2010 Oct;32(8):753-6. doi: 10.1007/s00276-010-0679-4. Epub 2010 May 30.
The aim of this study was to clarify the morphology and topography of the deep layer of levator labii superioris alaeque nasi muscle (LLSAN) and the transverse part of the nasalis. Anatomical variations in the topographic relationships were also described to understand the function of the LLSAN and the transverse part of the nasalis.
Anatomical dissections were performed on 40 specimens of embalmed Korean adult cadavers.
The LLSAN was divided into two layers, which were superficial and deep in the levator labii superioris muscle (LLS), respectively. The superficial layer of LLSAN descended on the LLS, and the deep layer was located deep in the LLS. The deep layer of LLSAN originated from the superficial layer of LLSAN and the frontal process of the maxilla. It inserted between the levator anguli oris and the orbicularis oris muscles. This transverse part of the nasalis received some muscle fibers from the superficial layer of LLSAN in 90% (36/40) of specimens. The transverse part of the nasalis originated from the maxilla and ascended, passing posterior to the superficial layer of LLSAN in 65% (26/40) of specimens. However, it originated as two muscle bellies from the maxilla and the upper half of the alar facial crease, respectively, in 35% (14/40) of specimens.
These findings will be crucial data to understand the structure and function of the LLSAN and the transverse part of the nasalis.
本研究旨在阐明提上唇鼻翼肌深层（LLSAN）和鼻肌横部的形态及局部解剖关系。还描述了局部解剖关系的解剖变异，以了解LLSAN和鼻肌横部的功能。
对40例防腐处理的韩国成年尸体标本进行解剖。
LLSAN分为两层，分别位于提上唇肌（LLS）的浅面和深面。LLSAN的浅层沿LLS下行，深层位于LLS的深面。LLSAN的深层起自LLSAN的浅层和上颌骨额突，止于提口角肌和口轮匝肌之间。在90%（36/40）的标本中，鼻肌横部接受来自LLSAN浅层的一些肌纤维。在65%（26/40）的标本中，鼻肌横部起自上颌骨并上行，经过LLSAN浅层的后方。然而，在35%（14/40）的标本中，它分别起自上颌骨和鼻翼面部皱襞上半部分的两个肌腹。
这些发现将是理解LLSAN和鼻肌横部结构与功能的关键数据。
