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Anat Cell Biol

Published online July 10, 2020

https://doi.org/10.5115/acb.20.058

Copyright © Korean Association of ANATOMISTS.

An unusual finding of the pectoralis major muscle: decussation of sternal fibers across the midline

Halle Burley1 , Georgi P. Georgiev2 , Joe Iwanaga3 , Aaron S. Dumont3 , R. Shane Tubbs3,4,5,6

1Western University of Health Sciences, College of Osteopathic Medicine of the Pacific Northwest, Lebanon, OR, USA, 2Department of Orthopedics and Traumatology, University Hospital Queen Giovanna-ISUL, Medical University of Sofia, Sofia, Bulgaria, 3Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, 4Department of Structural and Cellular Biology, Tulane University School of Medicine, New Orleans, LA, 5Department of Neurosurgery and Ochsner Neuroscience Institute, Ochsner Health System, New Orleans, LA, USA, 6Department of Anatomical Sciences, St. George’s University, St. George’s, Grenada, West Indies

Correspondence to:Joe Iwanaga
Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA 70112, USA
E-mail: iwanagajoeca@gmail.com

Received: March 16, 2020; Revised: April 23, 2020; Accepted: April 29, 2020

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

Variations of the pectoralis major muscle are commonly seen. However, during the routine dissection of an adult male cadaver, an apparently uncommon muscular variant was identified. In this cadaver, the sternal heads of the left and right pectoralis muscles crossed the midline and interdigitated with one another. In addition, the clavicular heads of both pectoralis major muscles were separated from the remaining parts of the muscles. Such anatomical variants such be kept in mind by clinicians and surgeons during patient evaluation and treatment.

Keywords: Pectorais muscles, Anatomic variation, Anatomy, Cadaver

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