Question

Myelin sheath of nerve fibres is produced by

• A. Axon
• B. Connective tissue
• C. Schwann cells
• D. Neuroglia

Answer 1

Answer: (C)

Schwann cells

• Myelin is a layered substance made of phospholipid, cholesterol and protein that covers the axons of the neurons.
• It insulates the nerve impulses from the surrounding nerve fibres.
• It also increases the speed of impulses through nerve axons.
  
• It is formed in the central nervous system by glial cells called the oligodendrocytes.
• Whereas, in the peripheral nervous system they are produced by Schwann cells.
  
• So, the correct answer is 'Schwann cells'.