Brachial plexus injuries are complex medical conditions that in most cases cause major functional problems for patients. From the brachial plexus, all the nerves that inerve the upper limb are excited, motorically and sensitively, such as radial nerves, ulnaris and medianus. Brachial plexus injuries today most often occur in traffic accidents, with special emphasis on motorcycle accidents. Depending on which part of the brachial plexus is injured, the patients have functional disadvantages of a particular group of arm muscles, starting from neurological defects and muscle dysfunction, to the unability of elbow flexion, shoulder rotation, and others. Brachial plexus injuries are most commonly divided into supraclavicular and infraclavicular, and depending on the location of the injury, one can immediately assume which nerves are injured. It is extremely important to do a neurological examination, as well as RTG and MRI, as a key tool that helps us diagnose pectoral injury. Surgical treatment of brachial plexus injury is necessary to restore the muscle function of the injured arm and it is best to approach the operation within the first 6 months of the injury. Denervated hands muscles tend to atrophy over time and therefore their reinvention is the main goal of surgery, whether by repairing a damaged nerve or by transferring a new nerve. Thanks to modern surgery, especially microsurgery, surgeons today have many options for repairing the nerves, among which the best methods are the direct sewing of nerves (neurorrhaphy), nerve grafting and nerve transfer from other parts of the body.