Supernumerary humeral heads of the biceps brachii muscle revisited |
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Authors: | Rodríguez-Niedenführ Marc Vázquez Teresa Choi David Parkin Ian Sañudo José R |
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Affiliation: | Unit of Anatomy and Embryology, School of Medicine, Autonomous University of Barcelona, Spain. |
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Abstract: | Supernumerary humeral heads of the biceps brachii muscle were found in 27 (15.4%) of 175 cadavers. They were bilateral in five cadavers and unilateral in 22 (8 left, 14 right), giving a total of 32 examples in 350 arms (9.1%). Depending on their origin and location, the supernumerary heads were classified as superior, infero-medial, and infero-lateral humeral heads. Previous studies were reviewed using this classification. The infero-medial humeral head was observed in 31 of 350 (9%) arms and was therefore the most common variation. The superior humeral head was observed in five (1.5%). The infero-lateral humeral head was the least common variation, observed only in one (0.3%) of 350 arms. A biceps brachii with three heads was observed in 27 of 350 (7.7%) arms and with four heads in five (1.4%) arms. |
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Keywords: | muscular variations arm muscles supernumerary heads biceps brachii |
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