Given the question: Answer the following question given this paragraph: The axon of many neurons has an outer layer called a myelin sheath (see Figure above ). Myelin is a lipid produced by a type of a glial cell known as a Schwann cell. The myelin sheath acts like a layer of insulation, similar to the plastic that encases an electrical cord. Regularly spaced nodes, or gaps, in the myelin sheath allow nerve impulses to skip along the axon very rapidly. Q: What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord? Choices: - lipids sheath - nerve sheath - layer sheath - myelin sheath A:
The answer is:
myelin sheath