1. Complete unilateral absence of trapezius muscle;Allouh M;McGill J Med,2004
2. Doubled pectoralis quartus, axillary arch, chondroepitrochlearis, and the twist of the tendon of pectoralis major;Bergman RA.;Anat Anz,1991
3. BergmanRA AfifiAK MiyauchiR.2008.Illustrated Encyclopedia of Human Anatomic Variation. Available at:http://www.anatomyatlases.org/AnatomicVariants/AnatomyHP.shtml(accessed 13 October 2015).
4. Long Thoracic Nerve