This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dislocation of Shoulder, Subject name: Orthopaedics
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 
Select and explain. 
A. radial nerve, B. ulnar nerve, C. axillary nerve, D. musculocutaneous nerve
D: musculocutaneous nerve
Answer: D: musculocutaneous nerve 
Explanation: 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.