Abe S, Ouchi Y, Ide Y, Yonezu H
Tokyo Dental College, Dept. of Anatomy, Chiba, Japan.
Cranio. 1997 Jul;15(3):203-7. doi: 10.1080/08869634.1997.11746013.
The lateral pterygoid muscle plays an important role in the movement of the mandible and has been studied from several points of view, including structural and functional anatomy. What matters clinically is the relative position of the muscle fibers attached medially to the mandibular condyle. In the following study, we observed not only the attachment of the lateral pterygoid muscle fibers to the articular disk, but also the relative position of the mandibular condyle to a base line set up on the mandibular condyle. According to our observations, the lateral pterygoid muscle fibers attach to the articular disk at the inner point of the medial pole. Based on this finding, we can say that the muscle fibers can both draw the articular disk anteriorly and balance it by supporting it posteriorly. That is to say, the lateral pterygoid muscle has two actions: to elevate the articular disk anteriorly and to support the articular disk. Furthermore, the sphenomandibular ligament has continuity with the articular disk tissue medially. This relationship suggests that the ligament fibers attached to the articular disk draw the disk posteriorly in its course of mandibular closing, thus enabling the articular disk to move smoothly.
翼外肌在下颌骨运动中起重要作用，并且已经从包括结构和功能解剖学等多个角度进行了研究。临床上重要的是内侧附着于下颌髁突的肌纤维的相对位置。在以下研究中，我们不仅观察了翼外肌纤维与关节盘的附着情况，还观察了下颌髁突相对于在下颌髁突上设定的基线的相对位置。根据我们的观察，翼外肌纤维在内侧极的内侧点附着于关节盘。基于这一发现，我们可以说肌纤维既能向前牵拉关节盘，又能通过在后方支撑它来使其保持平衡。也就是说，翼外肌有两种作用：向前提升关节盘和支撑关节盘。此外，蝶下颌韧带在内侧与关节盘组织相连。这种关系表明，附着于关节盘的韧带纤维在下颌闭合过程中向后牵拉关节盘，从而使关节盘能够顺利移动。
