Neurolemma, also known as the neurilemma, is a term used to describe the sheath of cells that surrounds and protects nerve fibers. There are a variety of synonyms that can be used to describe the neurolemma, including the perineurium, endoneurium, and epineurium. The perineurium refers to the outermost layer of the neurolemma, while the endoneurium describes the innermost layer. The epineurium is a tough, fibrous layer that covers the entire nerve. Other terms that can be used to describe the neurolemma include the neurothelium, fascicle, and axolemma. Regardless of the term used, the neurolemma plays an important role in protecting and supporting nerve fibers throughout the body.