TITLE

Brachialis Muscle Supplied by a Combined Branch of Median Nerve Roots: A Report of Anatomical Variation with Clinical Implications

AUTHOR(S)
Singh, Seema; Rani, Neerja; Kumar, Hitesh; Sharrif, A.; Roy, T. S.
PUB. DATE
February 2013
SOURCE
International Medical Journal;Feb2013, Vol. 20 Issue 1, p108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Objective: To observe and document the variation of innervations of the brachialis muscle (BRM), which is the chief flexor of the forearm. This report will assist clinicians and surgeons by considering anatomical anomalies associated with the median nerve (MN) and its branch to the anterior compartment muscle of the upper arm. Material and Methods: The arm region of a 50 year embalmed male cadaver during educational gross anatomy dissection. Results: We found that the BRM was innervated by a combined branch (C5, 6, 7 and C8, Tl) arising from both medial and lateral roots of the MN which was lateral to the brachial artery. The musculocutaneous nerve (MCN) pierced the coraco- brachialis muscle and passes obliquely to the lateral side of the arm between the biceps brachii and the BRM, supplying coraco- brachialis and two heads of the biceps brachii. Later it pierces the deep facia above elbow and continues as the lateral cutaneous nerve of the forearm. The other limb of the cadaver did not show any such variation. No other neural, arterial or muscular variation was observed in either of the limbs. Conclusion: A rare anatomical variation in which BRM was innervated by a combined branch (C5, 6, 7 and C8, Tl) arising from both medial and lateral roots of the MN and not by a branch of MCN is reported. Likely clinical scenario in subjects with such variation with implication on surgical management of brachial plexus (BP) injuries is also discussed.
ACCESSION #
86404153

 

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