03 May 2025
: Case report 
Psoas Quartus and Femoral Nerve Branching: A Case Report and Potential Clinical Implications
Congenital defects / diseases
Joshua Wang
ABCDEF 1, Chun Yeung ABCDEF 1, Eric Chang ABCDEF 1, Jason M. Bourke ABCDE 2*
DOI: 10.12659/AJCR.945927
Am J Case Rep 2025; 26:e945927
Figure 2 Diagrammatic representation of reported psoas quartus variations and their associated femoral nerves in left anterior oblique view. (D) Description from this study. (C) Description from Wong et al. (A) Description from Tubbs et al. (B) Description from Parker et al. We excluded the description by Clarkson and Rainy due to its limited description of femoral nerve distribution around the muscle. femoral n. – femoral nerve; i minor – iliacus minor; p major – psoas major; p quartus – psoas quartus; quad lumb – quadratus lumborum.