Newly revealed anatomy of the bucinator muscle: An anatomical and histological study

IF 2 3区 医学 Q2 ANATOMY & MORPHOLOGY Annals of Anatomy-Anatomischer Anzeiger Pub Date : 2024-06-25 DOI:10.1016/j.aanat.2024.152297
Joe Iwanaga , Keiko Fukino , Norio Kitagawa , Ana Carrera , Francisco Reina , Maria Cristina Manzanares-Cespedes , Mi-Sun Hur , Miguel A. Reina , R. Shane Tubbs
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Abstract

Background

Current anatomical knowledge of the origin of the bucinator muscle (BM), i.e., long thin attachments on the maxilla and mandible and the pterygomandibular raphe (PMR), is not supported by anatomical dissection of this muscle. The aim of this study was therefore to investigate the detailed morphology of the BM and associated structures and to discuss its function.

Methods

The anatomy of the BM and related structures was investigated in 15 cadaveric heads using a surgical microscope and histological analysis.

Results

The inferior fibers of the BM originated from a small retromolar area (internal oblique line), which shared a common tendon with the deep tendon of the temporalis. The superior fibers of the BM originated from the maxillary tuberosity. The middle fibers originated the pterygoid hamulus. No PMR was identified in any of the specimens, but the border between the BM and superior pharyngeal constrictor muscle (SC) was clear because the muscle fibers followed different directions. Some horizontal fibers were continuous between the BM and SC.

Conclusions

Our results suggest the need to revise established accounts of the origins of the bucinator (the maxillary tuberosity, conjoint tendon of the temporalis, and pterygoid hamulus without a pterygomandibular raphe. It also needs to be noted that some of its fibers merge directly with the SC.

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新发现的口角肌解剖结构:解剖学和组织学研究
背景:目前对咬肌起源的解剖学知识,即上颌骨和下颌骨上的细长附着物以及翼颌下缘(PMR),并没有得到对该肌肉解剖学解剖的支持。因此,本研究旨在调查 BM 及其相关结构的详细形态,并讨论其功能:方法:使用手术显微镜和组织学分析方法对 15 具尸体头部的横纹肌和相关结构进行了解剖研究:BM的下部纤维起源于一个小的后摩尔区(内斜线),它与颞肌深部肌腱共享一条共同的肌腱。BM的上部纤维源自上颌结节。中间纤维起源于翼束肌。在所有标本中均未发现咽后肌,但咽后肌与咽上收缩肌(SC)之间的边界清晰可见,因为肌纤维的方向不同。一些水平纤维在 BM 和 SC 之间是连续的:我们的研究结果表明,有必要修改关于颊肌(上颌结节、颞肌联合肌腱和无翼下颌剑突的翼状肌)起源的既有说法。还需要注意的是,它的一些纤维直接与 SC 融合。
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来源期刊
Annals of Anatomy-Anatomischer Anzeiger
Annals of Anatomy-Anatomischer Anzeiger 医学-解剖学与形态学
CiteScore
4.40
自引率
22.70%
发文量
137
审稿时长
33 days
期刊介绍: Annals of Anatomy publish peer reviewed original articles as well as brief review articles. The journal is open to original papers covering a link between anatomy and areas such as •molecular biology, •cell biology •reproductive biology •immunobiology •developmental biology, neurobiology •embryology as well as •neuroanatomy •neuroimmunology •clinical anatomy •comparative anatomy •modern imaging techniques •evolution, and especially also •aging
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