Type of Article:  Case Report

Volume 6; Issue 2.1 (April 2018)

Page No.: 5110-5113

DOI: https://dx.doi.org/10.16965/ijar.2018.132


Sakkarai Jayagandhi *1, Rajalakshmi Rajasegaran 2, Suman Verma 3, Virender Kumar Nim 4.

1 Assistant Professor, Department of Anatomy, Pondicherry Institute of Medical Sciences, Pondicherry, India.

2Assistant Professor, Department of Physiology, Indira Gandhi Medical College and Research Institute, Pondicherry, India.

3 Assistant Professor Department of Anatomy Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Puducherry – 605006, India.

4 Professor & Head, Department of Anatomy, Pondicherry Institute of Medical Sciences, Pondicherry, India.

Address for Correspondence: Dr. Sakkarai Jayagandhi, Assistant Professor, Department of Anatomy, Pondicherry Institute of Medical Sciences, Pondicherry – 605014. India. Phone: +91 –9894257906 E-Mail: sjayagandhi@gmail.com


Anatomical variations involving the brachial plexus are not uncommon. Abnormal communications among the branches of musculocutaneous nerve especially those involving the posterior division are widely reported due to their significance in various surgical procedures performed in this region. During the routine gross anatomical dissection, we observed the bilateral absence of musculocutaneous nerve in two male cadavers aged 60 and 65 years and the muscles of anterior compartment of arm were innervated by the braches from the Median nerve.  In case 1, it was observed that in the right and left arm, branches from the median nerve supplied the muscles of the anterior compartment namely the coracobrachialis, biceps brachii and brachialis. The branch which innervated the brachialis muscle later continued as lateral cutaneous nerve of forearm. In case 2, Absence of MCN observed bilaterally wherein right arm, wherein, a single branch from median nerve supplied the coracobrachialis muscle. Another branch from the median nerve, after passing through the lower end of coracobrachialis, divided into an oblique and a vertical branch which supplied the biceps brachii and brachialis respectively. These anatomical variations in the course of musculocutaneous and median nerve should be considered during surgical procedures and while performing nerve conduction studies.

Key words: Biceps brachii, Brachialis. Brachial plexus, Coracobrahialis, Median nerve, Musculocutaneous nerve.


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Cite this article: Sakkarai Jayagandhi, Rajalakshmi Rajasegaran, Suman Verma, Virender Kumar Nim. BILATERAL ABSENCE OF MUSCULOCUTANEOUS NERVE: REPORT OF TWO CASES. Int J Anat Res 2018;6(2.1):5110-5113. DOI: 10.16965/ijar.2018.132