Bifurcation of the long head of the biceps brachii

Rarely, a fourth head occurs, arising from the outer side of the humerus, from the intertubercular groove, or from the greater tubercle.1 There have been some other reports of unusual origins for the accessory long head of the biceps, such as originating from the pectoralis major.6 There have also been 2 reported cases with a bifurcate origin of the long head of the biceps tendon, which were incidentally encountered during diagnostic glenohumeral arthroscopy.