The plexus brachialis is a complex network of nerves located in the shoulder region. It supplies sensation and motor function to the upper limb. There are various synonyms for the plexus brachialis, including brachial plexus, brachial nerve plexus, and plexus of the arm. The plexus brachialis is comprised of five major nerves: the musculocutaneous, axillary, median, ulnar, and radial nerves. These nerves control movements in the shoulder, upper arm, elbow, wrist, and hand. Injuries to the plexus brachialis can result in severe pain, paralysis, or numbness in the affected limb. Hence, it is essential to identify and treat injuries to the plexus brachialis promptly.