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Myelinated and Unmyelinated Fibres

Saltatory tra...

Question

Saltatory transmission occurs in

A

Spinal nerve

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B

Myelinated fibre

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C

Nonmyelinated fibre

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D

None of the above

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Solution

The correct option is B
Myelinated fibre

Saltatory conduction (from the Latin saltare, to hop or leap) is the propagation of action potentials along myelinated axons from one node of Ranvier to the next node, increasing the conduction velocity of action potentials.

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Q. Give the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre.

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

Q. At intervals, myelinated nerve fibres possess unmyelinated areas called ______.

A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

Q. Short / Long answer type questions.
Describe the events in the transmission of nerve impulses in a non-myelinated nerve fibre. How do these events differ from those occurring in a myelinated neuron?

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