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Three‐headed biceps brachii muscle associated with duplicated musculocutaneous nerve
Author(s) -
AbuHijleh Marwan F.
Publication year - 2005
Publication title -
clinical anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 71
eISSN - 1098-2353
pISSN - 0897-3806
DOI - 10.1002/ca.20100
Subject(s) - musculocutaneous nerve , medicine , biceps , anatomy , brachialis , supernumerary , median nerve , forearm , humerus , dissection (medical) , brachial plexus
Abstract A unilateral three‐headed biceps brachii muscle coinciding with an unusual variant of the musculocutaneous nerve was found during routine dissection of a 79‐year‐old male cadaver. The supernumerary bicipital head originated from the antero‐medial surface of the humerus just beyond the insertion of the coracobrachialis, and inserted into the conjoined tendon of biceps brachii. Associated with this muscular variant was a duplicated musculocutaneous nerve. The proximal musculocutaneous nerve conformed to the normal pattern only in its proximal part, and terminated after innervating the coracobrachialis and biceps brachii muscles. The distal musculocutaneous nerve arose from the median nerve in the lower arm, then passed laterally between the supernumerary bicipital head and the brachialis muscles, supplying both and terminating as the lateral cutaneous nerve of the forearm. The supernumerary bicipital head and the accompanying anomaly of the musculocutaneous nerve seem to be unique in literature. Clin. Anat. 18:376–379, 2005. © 2005 Wiley‐Liss, Inc.