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Nervous Tissue

The area wher...

Question

The area where the myelin sheath is absent in the nerve fibre is called ________.

A

Axon

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B

Cyton

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C

Dendrites

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D

Node of Ranvier

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Solution

The correct option is D Node of Ranvier
A nerve cell (neuron) comprises a cyton (cell body), dendrites, and a single nerve fibre or axon. Some nerve fibres have a covering of the myelin layer that insulates the axons. Nodes of Ranvier are small gaps found in such myelinated axons. They propagate the transmission of nerve impulses.
Thus, the correct answer is option (D), 'Node of Ranvier'.

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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.

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.

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(i) Saltatory type of present in non-myelinated nerve fibres (axons) only
(ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present
(iii) Nodes of Ranvier of axon is exposed to ECF
(iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier
(v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation
How many of the statements are correct?

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