Incidence Of The Third And Fourth Head Of The Biceps Brachii Muscle In Caucasian Race – A Study And Review Of Literature

Anatomic variations in the heads of biceps brachii are not uncommon. It varies from one head to seven heads buttwo heads (long and short) are considered normal. In this study, 56 arms from 28 cadavers were studied for thirdand fourth heads in the anatomy laboratory of Weill Cornell Medicine. We observed supernumerary heads in 5cadavers (8.92%), out of which three heads were seen in 4 cadavers (7.14%) and four heads in only one cadaver(1.78%). Clinically, these kinds of anomalies are important because supernumerary heads could compressneighboring blood vessels and nerves.