Variation of the supernumerary head of the biceps brachii muscle: two case reports and literature review

Abstract

Supernumerary heads of the biceps brachii muscle have been widely studied regarding their origin, insertion, size, innerva- tion and racial differences. The most frequent variation of the biceps brachii is its supernumerary heads. During our routine dissection studies, we encountered supernumerary head of the biceps brachii muscle on two cadavers. Additionally, the supernumerary heads had abnormal attachments. We think that such variations should be kept in mind during surgical and diagnostic procedures.