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Anat Cell Biol

Published online September 1, 2022

https://doi.org/10.5115/acb.22.108

Copyright © Korean Association of ANATOMISTS.

Variant muscle fibers connecting the orbicularis oculi to the orbicularis oris: case report

Norio Kitagawa1,2 , Joe Iwanaga2,3,4,5,6 , R.Shane Tubbs3,4,7,8,9 , Hongtae Kim10 , Yong-Suk Moon10 , Mi-Sun Hur10

1Oral Medicine Research Center, Fukuoka Gakuen, Fukuoka, 2Department of Oral and Maxillofacial Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan, 3Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, 4Department of Neurology, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA, 5Dental and Oral Medical Center, Kurume University School of Medicine, Kurume, Fukuoka, 6Division of Gross and Clinical Anatomy, Department of Anatomy, Kurume University School of Medicine, Kurume, Fukuoka, Japan, 7Department of Anatomical Sciences, St. George’s University, St. George’s, Grenada, West Indies, 8Department of Structural & Cellular Biology, Tulane University School of Medicine, New Orleans, LA, 9Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA, 10Department of Anatomy, Daegu Catholic University School of Medicine, Daegu, Korea

Correspondence to:Mi-Sun Hur
Department of Anatomy, Daegu Catholic University School of Medicine, Daegu, Korea
E-mail: mshur@cu.ac.kr
*These authors contributed equally to this work.

Received: May 26, 2022; Accepted: June 16, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.

Keywords: Orbicularis oculi, Orbicularis oris, Connecting fibers, Anatomical variations, Cadaver

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