Introduction: Musculocutaneous nerve is nerve of anterior compartment of arm branches out from the lateral cord of brachial plexus, supplies coracobrachialis, biceps & brachialis. After piercing coracobrachialis later it pierces deep fascia to continue as lateral cutaneous nerve of forearm without exhibiting any communication with any other nerve
Aim: The aim of this study was to a study in the course of MCN which could be important for clinical investigation and the surgical treatment of peripheral nerve injury.
Material & methods: The 50 upper extremities of both male & female cadavers of aged between 50 yrs to 80yrs were taken for this study from the department of anatomy VIMS& RC Bangalore. During the routine dissection of both the upper limb, Musculocutaneous nerve was dissected carefully from the brachial plexus, its origin, course, branches, termination & communication with other nerves in the arm was looked & recorded.
Results: out of 50 dissected upper limb we found two bilateral variation in the course of MCN not piercing the coracobrachialis muscle, in 2 cases musculocutaneous joined with median nerve without piercing coracobrachialis & in 3 cases with piercing coracobrachialis, giving branch to coracobrachialis muscle, Biceps, Brachioradialis muscle & passing between Biceps & Brachioradialis muscle, later piercing deep fascia to become lateral cutaneous nerve of forearm.
Conclusions: These variations have clinical significance during surgical procedures, in brachial plexus block and in diagnostic clinical neurophysiology. Knowledge of such variations helps in the management of shoulder and arm traumas, nerve grafting and diagnosing peripheral neuropathies.
musculocutaneous nerve (MCN), coracobrachialis muscle (CB), biceps, Median nerve (MN), Brachial plexus, Peripheral nerve repair.