MSFinals-2834

A 27-year-old male presented to the emergency department after sustaining a shoulder dislocation during a game of football. The medical team reduced his shoulder and immobilized it with a sling. During the examination, the doctor assessed the sensation in the ‘regimental badge area’ and found it to be normal. Which nerve is frequently affected in cases of shoulder joint dislocation, and which nerve was the doctor testing for in this scenario?