Abstract
Absence of musculocutaneous nerve was observed during study of 60 dissected upper limb specimens. The area of innervation was supplied by median nerve. Knowledge of this anatomical variation is of clinical significance to neurologists, traumatologists and surgeons as injury to median nerve in this case would lead to unexpected paralysis of flexor muscles of arm and hypoaesthesia of lateral surface of forearm.
Highlights
Musculocutaneous Nerve (MCN) is a branch from lateral cord of brachial plexus arising opposite lower border of teres minor
Lateral cutaneous nerve of forearm was given from lateral side of Median Nerve (MN) just above the elbow
Significant variations in the nerve patterns may be a result of altered signalling between mesenchymal cells and neuronal growth cones or circulatory factors at the time of fusion of brachial plexus[3]
Summary
Musculocutaneous Nerve (MCN) is a branch from lateral cord of brachial plexus arising opposite lower border of teres minor. It pierces the coracobrachialis and descends laterally between biceps and brachialis to lateral side of arm. It pierces the deep fascia lateral to tendon of biceps, continuing as lateral cutaneous nerve of forearm. It supplies the coracobrachialis, both heads of biceps and brachialis[1]. It lies deep to bicipital aponeurosis and anterior to brachialis It usually enters the forearm between heads of pronator teres[1]
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