Traumatic anterior dislocation of shoulder with sensory loss in lateral side of forearm and weakness of flexion of elbow joint, most likely injured nerve is: (A) radial nerve, (B) ulnar nerve, (C) axillary nerve, (D) musculocutaneous nerve
Answer is D. Ans. is 'd' i.e.Musculocutaneous nerve Flexion at the elbow is brought about by- BrachialisBiceps brachi BrachioradialisTheir nerve supply :Brachialis -- Musculocutaneous nerveBiceps brachi - Musculocutaneous nerveBrachioradialis - Radial nerveSo the nerve injured is either musculocutaneous nerve or radial nerve.The cutaneous nerve supply of :Musculocutaneous nerve - * lateral cutaneous nerve of forearm - skin of the lateral side of the forearmRadial nerve - * Post. Cutaneous nerve of arm - Supplies skin on backlower lateral cutaneous nerve of armpost cutaneous nerve of forearm.- posterior aspect of fore armThus sensory loss in lateral side of forearm and weakness of flexion of elbow joint is due to injury to musculocutaneous nerve.