Downloads: 1 | Views: 107 | Weekly Hits: ⮙1 | Monthly Hits: ⮙1

Case Studies | Anatomy and Histology | India | Volume 11 Issue 12, December 2022

Absence of the Musculocutaneous Nerve with a Rare and Unusual Innervation of Median Nerve - A Case Report

Kalaiselvi .C ^[3] | Girijakumari .K ^[3]

Abstract: Musculocutaneous nerve is the nerve of the arm. It is one of the terminal branches of lateral cord of brachial plexus. This nerve is responsible for innervation of flexor compartment of arm and for cutaneous innervation on lateral surface of forearm. Median nerve is formed by the union of lateral and medial roots respectively arising from lateral and medial cords of brachial plexus. Median nerve doesn?t give any branch in the arm. During routine dissection of a 70 - year - old male cadaver allotted for the undergraduate students of the 2020 - 2021 batch in the department of anatomy, SreeMookambika Institute of Medical Sciences, Kulasekharam, we found that the musculocutaneous nerve was absent. The formation of median nerve was found to be normal, but the lateral root of median nerve gives muscular branch to coracobrachialis. The median nerve gives two muscular branches one supplies the biceps brachii muscle and the other further divides in to two, one supplies the brachialis muscle and the other continues as lateral cutaneous nerve of forearm. The knowledge about the absence of musculocutaneous nerve and the unusual supply of median nerve should be kept in mind by the anatomist and clinicians. These observations should be considered when a high median nerve paralysis is shown to originate in the axilla or proximal arm in a patient presenting with weakness of forearm flexion and supination.

Keywords: Median nerve, musculocutaneous nerve, lateral cutaneous nerve of fore arm, coracobrachialis, biceps brachi and brachialis

Edition: Volume 11 Issue 12, December 2022,

Pages: 564 - 566