alleryThe unmyelinated nerve fibre is commonly found in
Acranial and spinal nerves
Bthe cerebral cortex only
Cthe retina of the eye
Dautonomous and somatic systems
Answer & Solution
Correct answer: D. autonomous and somatic systems
1. An unmyelinated fibre is enclosed by a Schwann cell that forms no sheath.
2. Those fibres are commonly found in the autonomous and the somatic neural systems.
3. Spinal and cranial nerves carry the myelinated type instead.
4. Naming the wrong fibre type predicts the wrong conduction speed.
_Source: syllabus Biology Ch18 'Neural Control and Coordination', section 18.3_
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