MS-3231

A 26-year-old arrives at the emergency department with a dislocated shoulder after playing basketball. The joint is relocated, but he experiences pain and limited mobility in his affected arm. During the examination, it is observed that his right shoulder’s flexion, extension, abduction, and external rotation are weakened. Additionally, he reports a loss of sensation in the lateral upper arm on the right side.

Which muscle/s receive innervation from the affected nerve in this case?