Anatomically, damage to the<unk>  nerve or suppression of it causes the palsy. This suppression, referred to as entrapment, causes the nerve pathway to become smaller and impulses cannot move through the nerve as easily. Furthermore, if trauma causes damage to the myelin sheath, or injures the nerve another way, this will also reduce the ability of nerve impulse flow. Usually, an outside force is acting to suppress the nerve, or cause nerve damage. Most commonly, shoulder dislocation or fractions in the shoulder can cause the palsy. Contact sports such as football and hockey can cause the injury Other cases have been caused by repeated crutch pressure or injuries accidentally caused by health professionals (iatrogenesis). Furthermore, following an anterior shoulder operation; damage to the<unk>  nerve is possible and has been documented by various surgeons, thus causing<unk> . Other possible causes include: deep infection, pressure from a cast or splint, fracture of the humerus, or nerve disorders in which the nerves become inflamed. There are rare causes of<unk>  that do occur. For instance,<unk>  can occur after there is blunt trauma in the shoulder area without any sort of dislocation or fracture. Examples of this blunt trauma may include: being hit by heavy an object, falling on shoulder, a strong blow while participating in boxing, or motor vehicle accidents. Another rare cause of<unk>  can occur after utilizing a side birthing position. When the patient lies on their side for a strenuous amount of time, they can develop<unk> . This rare complication of labor can occur due to the prolonged pressure on the<unk>  nerve while in a side-birth position. Some patients who are diagnosed with nodular fasciitis may develop<unk>  if the location of the rapid growth is near the axilla. In the case of Nodular Fasciitis, a fibrous band or the growth of a schwannoma can both press against the nerve, causing<unk> . An injury to the<unk>  nerve normally occurs from a direct impact of some sort to the outer arm, though it can result from injuring a shoulder via dislocation or compression of the nerve. The<unk>  nerve comes from the posterior cord of the brachial plexus at the coracoid process and provides the motor function to the deltoid and teres minor muscles. An EMG can be useful in determining if there is an injury to the<unk>  nerve. The largest numbers of<unk> es arise due to stretch injuries which are caused by blunt trauma or iatrogenesis.<unk>  is characterized by the lack of shoulder abduction greater than 30 degrees with or without the loss of sense in the low two thirds of the shoulder. Normally the patients that have<unk>  are involved in blunt trauma and have a number of shoulder injuries. Surgery is not always required to solve the problem (information from: Midha, Rajiv, Zager, Eric. Surgery of Peripheral Nerves: A Case-Based Approach. Thieme Medical Publishers, Inc. 2008.)
Axillary nerve palsy
Axillary nerve dysfunction
Fourth nerve palsy
Vocal cord paresis
Median nerve palsy
Sixth nerve palsy
Facial nerve paralysis
Radial nerve dysfunction