<unk>  occurs in the peripheral nervous system and most often in the upper-limb (arms), accounting for 73.5% of all peripheral nerve injury cases. Of these cases, the ulnar nerve was most often injured. Peripheral nerves are structured so that the axons are surrounded by most often a myelinated sheath and then an endoneurium. A perineurium surrounds that and the outermost layer is considered the epineurium. When injury occurs, “local vascular trauma leads to hemorrhage and edema (swelling), which results in vigorous inflammatory response resulting in scarring of the injured segment. In most cases, due to the extreme nature of the injury, there is typically complete loss of function.
Neurotmesis
Axonotmesis
Hutchinson's mask
Laryngeal mask airway
Electrolarynx
Cragie tube
Surgical mask
Schimmelbusch mask