Abstract
Anatomical muscles’ variation may face clinician and surgeon with some dilemmas. Obviously, reporting a rare case of variations could explore some unexplained and unexpected clinical symptoms. Bilateral three head biceps, which had a supernumerary head with different origins in both right and left arms, is reported in this case report article. The crucial importance of arm muscles variations’ is because of their adjacent location to brachial nerve plexus and brachial vessels. Every single alteration in the direction of anatomical elements could result in pressure on nerve or vessels with clinical symptoms. Taken together, investigation and popularization of variations make a well-knowledged background for clinicians and surgeons.
 © 2019 Tehran University of Medical Sciences. All rights reserved.
 Acta Med Iran 2019;57(5):338-340.
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