Yu Sun Kyoung, Kim Tae-Hoon, Yang Kwang Yeol, Bae Christopher J, Kim Heung-Joong
Department of Anatomy and Orofacial Development, College of Dentistry, Chosun University, Gwangju, Korea.
Department of Anthropology, University of Hawai'i at Manoa, Honolulu, HI, USA.
Anat Cell Biol. 2021 Sep 30;54(3):308-314. doi: 10.5115/acb.21.074.
The temporalis muscle is usually described as a single layer originating at the temporal line, converging to a tendon, and inserting onto a narrow site of the coronoid process. However, recent studies have shown that the temporalis muscle can be divided into two or three separate segments and the distal attachment continues inferiorly beyond the coronoid process. Therefore, the aims of this study were to analyze the morphology of the temporalis muscle focusing on the tendinous attachment onto the coronoid process and to provide educational values. The temporalis muscle was carefully dissected in 26 cadavers and classified based on the muscle fascicle direction. Each divided part was sketched and measured based on bony landmarks to elucidate its tendinous insertion site onto the coronoid process, and the results obtained were reviewed through the literature. The temporalis muscle ends at two distinct terminal tendons with wider insertion sites than usually presented in textbooks and atlases and separates into two parts that combine to act as a single structural unit. The superficial part is a large fan-shaped muscle commonly recognized as the temporalis muscle. This converges infero-medially to form the superficial tendon and the lateral boundary of the retromolar triangle. Meanwhile, the deep part is a narrow vertically oriented rectangular muscle that converges postero-laterally to form the deep tendon and the medial boundary of the retromolar triangle. These results indicate that understanding the temporalis muscle's insertion site onto the coronoid process will be useful clinically with educational values during surgical procedures.
颞肌通常被描述为起源于颞线的单层肌肉，汇聚成肌腱，并插入冠状突的一个狭窄部位。然而，最近的研究表明，颞肌可分为两个或三个独立的节段，其远端附着点在冠状突下方继续延伸。因此，本研究的目的是分析颞肌的形态，重点关注其在冠状突上的肌腱附着情况，并提供教学价值。在26具尸体上仔细解剖颞肌，并根据肌束方向进行分类。根据骨性标志对每个分割部分进行绘图和测量，以阐明其在冠状突上的肌腱插入部位，并通过文献对所得结果进行综述。颞肌以两个不同的终末肌腱结束，其插入部位比教科书和图谱中通常显示的更宽，并分为两部分，这两部分结合起来作为一个单一的结构单元起作用。浅部是一块大的扇形肌肉，通常被认为是颞肌。它向内下汇聚形成浅肌腱和磨牙后三角的外侧边界。同时，深部是一块狭窄的垂直定向的矩形肌肉，向后外侧汇聚形成深肌腱和磨牙后三角的内侧边界。这些结果表明，了解颞肌在冠状突上的插入部位在手术过程中具有临床应用价值和教学价值。
