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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

ILAYPERUMA, Isurani; NANAYAKKARA, Ganananda  and  PALAHEPITIYA, Nadeeka. Incidence of Humeral Head of Biceps Brachii Muscle: Anatomical Insight. Int. J. Morphol. [online]. 2011, vol.29, n.1, pp.221-225. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022011000100037.

Biceps brachii is stated as one of the muscles that shows most frequent anatomical variations. Its most commonly reported anomaly is the presence of an accessory fascicle arising from the humerus which is termed as the humeral head of biceps brachii. Evidence shows a clear racial trend in the incidence of the humeral head of biceps brachii. Therefore, detailed knowledge of this variation in different populations is important for surgical interventions of the arm, nerve compression syndromes and in unexplained pain syndromes in the arm or shoulder region. The goal of this study was to elucidate the incidence and morphological features of this muscle in an adult Sri Lankan population. Upper extremities of the total of one hundred thirty five cadavers were dissected and studied for the presence of accessory heads of the biceps brachii muscle. The proximal and distal attachments of the humeral heads as well as their cranio-caudal, antero-posterior and medio-lateral dimensions were recorded. The incidence of humeral head of biceps brachii was found to be 3.7%. In all cases, it was found unilaterally and only in male subjects. The humeral head originated from the antero-medial aspect of the humeral shaft and descended and merged with the other two heads to form a common tendon. The results of the present study further highlight the racial variations in the incidence of humeral head of biceps brachii among Sri Lankans. Knowledge of the occurrence of humeral head of biceps brachii may facilitate preoperative diagnosis as well as the surgical procedures of the upper limb thus avoiding iatrogenic injuries.

Keywords : Humeral head of biceps brachii; Anatomical variation; Sri Lankan.

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