A) non myelinated nerve fibres
B) myelinated nerve fibres
C) both (a) and (b)
D) none of the above
Correct Answer: B
Solution :
Many small fibres are lying between the large nerve fibres. The large fibres are myelinated and the small one are unmyelinated. The central core of myelinated fibres is the axon. The axon is filled with axoplasm in its centre. Surrounding the axon is a myelin sheath that is often much ticker than axon itself. About once every, 1-3 milimeter along the length of myelin sheath is a node of Ranvier.
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