Accessory insertions of pectoralis major muscle to the brachial fascia: a case report.

Two accessory fibrous bands arising from the posterior aspect near the lateral border of the pectoralis major muscle were found to attach to the brachial fascia at the posterior arm region. Those bands were in intimate contact with the median nerve, brachial veins and its branches. They were thought to be remnants of the distal origin of the pectoralis major muscle. The impact of those fascial bands in the compression syndromes of the upper extremity and in the surgical operations directed to the fossa axillaris were discussed.