Kitagawa Norio, Iwanaga Joe, Tubbs R Shane, Kim Hongtae, Moon Yong-Suk, Hur Mi-Sun
Oral Medicine Research Center, Fukuoka Gakuen, Fukuoka, Japan.
Department of Oral and Maxillofacial Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Anat Cell Biol. 2022 Dec 31;55(4):497-500. doi: 10.5115/acb.22.108. Epub 2022 Sep 1.
The orbicularis oculi (OOc) is a sphincteric muscle of the eyelids, whereas contraction of the orbicularis oris (OOr), another sphincteric muscle, causes narrowing of the lips. Facial muscle fibers normally blend with adjacent muscles. However, muscle fibers connecting the various facial muscles that have different actions and that are located at distant sites, such as the OOc and the OOr have been rarely reported. Herein, we report a rare case of connecting fibers between the inferior margin of the OOc and the OOr. These connecting fibers were blended with the OOr between the inserting fibers of the levator labii superioris and levator anguli oris. Contraction of such variant muscles might affect typical facial expressions.
眼轮匝肌（OOc）是眼睑的环形肌，而口轮匝肌（OOr）作为另一块环形肌，其收缩会导致嘴唇变窄。面部肌肉纤维通常与相邻肌肉融合。然而，连接具有不同作用且位于远处的各种面部肌肉（如OOc和OOr）的肌肉纤维鲜有报道。在此，我们报告一例罕见的OOc下缘与OOr之间存在连接纤维的病例。这些连接纤维在提上唇肌和提口角肌的插入纤维之间与OOr融合。此类变异肌肉的收缩可能会影响典型的面部表情。
