Anatomy and Cell Biology

Korean Association of Anatomists (대한해부학회)
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Pectorobrachioepicondylaris musculoaponeurotic band: case description with evidence of median nerve compression

  • Ana Carrera (Department of Medical Sciences, Clinical Anatomy, Embryology and Neuroscience Research Group (NEOMA), Faculty of Medicine, University of Girona) ;
  • Arada Chaiyamoon (Department of Anatomy, Faculty of Medicine, Khon Kaen University) ;
  • Francisco Reina (Department of Medical Sciences, Clinical Anatomy, Embryology and Neuroscience Research Group (NEOMA), Faculty of Medicine, University of Girona) ;
  • Joe Iwanaga (Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine) ;
  • Aida Cateura (Department of Medical Sciences, Clinical Anatomy, Embryology and Neuroscience Research Group (NEOMA), Faculty of Medicine, University of Girona) ;
  • Miguel Angel Reina (Department of Anesthesiology, CEU-San Pablo University School of Medicine, Madrid-Montepríncipe University Hospital) ;
  • Jose Ramon Sanudo (Department of Human Anatomy and Embryology, Facultad de Medicina, Universidad Complutense de Madrid) ;
  • R. Shane Tubbs (Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine)
  • Received : 2023.01.06
  • Accepted : 2023.02.08
  • Published : 2023.06.30
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Abstract

Upper limb muscle variations can be encountered on imaging or at surgery. We report an unusual muscle and band found during routine dissection of the arm in a cadaver. This case is described and salient literature reviewed. A band was found that traveled from the insertion of the pectoralis major tendon distally and obliquely toward the medial intermuscular septum and medical epicondyle. Fibers of the brachialis were found to interdigitate into the band. A tunnel was formed that carried the median nerve and brachial vessels. Evidence of median nerve compression was observed. We considered this an example of a pectorobrachioepicondylaris muscle. However, some can lead to clinical presentations. Although the significance of the case reported herein is not certain, signs of median nerve compression were identified. We believe that the term pectorobrachioepicondylaris bests describes the muscle reported herein and that our case represents a previously unreported variant of this muscle.

Keywords

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].

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