A 32-year-old man involved in a motor vehicle accident was brought to the ER with injury over the left arm. The patient gave the history that the truck hit the car from the side and the patient sustained injuries to the left arm. The doctor on duty performed an examination of the injured site and ordered an x ray of the injured site. He complains of an inability to open his left hand and loss of sensation to a poion of his left hand. What is the most likely injury

A-Axillary nerve injury B-Radial nerve injury C-Median nerve injury D-Ulnar nerve injury The radial nerve is at risk of injury in its course in the radial groove around the mid-shaft of the humerus. There is loss of innervation of the extensor muscles in the forearm, resulting in wrist drop and an inability to extend the digits at the MCP joints. The sensory loss in cutaneous distribution of the radial nerve. The triceps muscle (extensor of the elbow) is typically spared.