Anna Jeon; Junghwan Kim & Je-Hun Lee

The aim of this study is to conduct an anatomical investigation of the morphology and innervation of the quadratus lumborum muscle in order to provide clinically relevant insights. This study was conducted on twenty-three QL muscles obtained from embalmed Korean cadavers. Regarding the superior attachment, 9.0 % of cases showed insertions extending from the 12th rib to the L3 vertebra, 48.0 % from the 12th rib to L4, and 43.0 % from the 12th rib to L5. In the investigation of the innervation of the QL muscle, 81.0 % of specimens demonstrated neural supply from the T12 to L3 spinal nerves, while 19.0 % exhibited innervation extending from T12 to L4. It is hoped that the results of this study will enhance the clinical understanding of the relationship between the quadratus lumborum muscle and its neural connections depending on muscle condition, thereby contributing to more effective analysis of pain.

KEY WORDS: Anatomy; Quadratus lumborum muscle; Entrapment; Pain.

JEON, A.; KIM, J. & LEE, J-H. A cadaver study of the quadratus lumborum muscle and its application to the relaxation effect for fencers. Int. J. Morphol., 43(4):1364-1369, 2025.