What is unique about the superficial layer is that they all start on a common tendon on the inside part of the humerus (the medial epicondyle)-- the big bone that sticks out on the inside part of the elbow joint. (all-about-arm-exercises.com)
It originates at the lateral epicondyle of the femur, just above the origin of the lateral head of the gastrocnemius. (fitoverfat.com)
It has therefore been suggested that the syndrome is not actually a friction syndrome and that it is caused by the compression of structures that lie between the iliotibial band and the lateral tibial epicondyle, subsequent to impaired hip muscle function (Fairclough et al. 2007). (strengthandconditioningresearch.com)