Question

Non-myelinated nerve fibres occur in _____________.

• A. Cranial nerves
• B. Autonomic nerves
• C. Optic nerves
• D. Spinal nerves

Answer 1

The correct option is B Autonomic nerves

• Non-myelinated nerve are the nerve cell in autonomic nervous system in which there is no myelin sheath surrounding its axon.
• Myelin is a lipid-rich (fatty) substance formed in the central nervous system (CNS) by glial cells called oligodendrocytes, and in the peripheral nervous system (PNS) by Schwann cells.
• Myelin insulates nerve cell axons to increase the speed at which information (encoded as an electrical signal) travels from one nerve cell body to another (as in the CNS) . Hence, Non-myelinated nerve fibres occur in autonomic nerves.

So, the correct answer is 'autonomic nerves'.