Anatomy and Cell Biology

Korean Association of Anatomists (대한해부학회)
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Variant muscle fibers connecting the orbicularis oculi to the orbicularis oris: case report

  • Norio Kitagawa (Oral Medicine Research Center) ;
  • Joe Iwanaga (Department of Oral and Maxillofacial Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University) ;
  • R.Shane Tubbs (Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine) ;
  • Hongtae Kim (Department of Anatomy, Daegu Catholic University School of Medicine) ;
  • Yong-Suk Moon (Department of Anatomy, Daegu Catholic University School of Medicine) ;
  • Mi-Sun Hur (Department of Anatomy, Daegu Catholic University School of Medicine)
  • Received : 2022.05.26
  • Accepted : 2022.06.16
  • Published : 2022.12.31
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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.

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Acknowledgement

The authors sincerely thank those who donated their bodies to science so that anatomical research could be performed. Results from such research can potentially increase mankind's overall knowledge that can then improve patient care. Therefore, these donors and their families deserve our highest gratitude [15]. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1C1C1003237).

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