English

Abstract

Biceps brachii is a double headed muscle. In terms of number and morphology of its head, it is one of the most variable muscles in the human body. Most common variation is third head, but four, five or even seven heads have been reported. In the present case report third head of biceps brachii was found on the flexor compartment of left arm of an adult female cadaver .The third head of biceps brachii originated from the anteromedial surface of the humerus below the insertion of coracobrachialis and which descended and merged with the other two heads to form common tendon and was inserted on to the radial tuberosity . Third heads might be significant in producing the strong flexion as well as supination of forearm. They may cause compression of neurovascular structures because of their close relationship to brachial artery and median nerve. Variant biceps brachii may confuse a surgeon who performs procedures on the arm and may lead to iatrogenic injuries. The surgeons and traumatologists have to keep such muscular variations in mind.