Question

What is true about unmyelinated nerve fiber?

• A. Not enclosed by both Schwann cells and a myelin sheath.
• B. Enclosed by a Schwann cell that does not form a myelin sheath.
• C. Not enclosed by a Schwann cell but enclosed by a myelin sheath.
• D. Not found in the autonomous and the somatic neural system.

Answer 1

The correct option is B Enclosed by a Schwann cell that does not form a myelin sheath.

Unmyelinated nerve fibres are those which are enclosed by Schwann cells however these Schwann cells do not form myelin sheath around the axon.
Unmyelinated nerve fibres are found in autonomous and somatic neural systems. Hence option b is correct in respect to unmyelinated nerve fibres.