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Spinal Nerves

Which of the ...

Question

Which of the following statements is true?

A

Saltatory conduction is seen in non - myelinated nerve fibres

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B

Nissl's granules are found in muscles fibres

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C

Non - myelinated nerve fibres do not possess nodes of Ranvier.

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D

Non - myelinated nerve fibres are completely enclosed by myelin sheath.

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Solution

The correct option is C Non - myelinated nerve fibres do not possess nodes of Ranvier.
The non - myelinated nerve fibres do not possess nodes of Ranvier.
In myelinated nerve fibre, the myelin sheath is not continuous and remains interrupted at some places. These are known as nodes of Ranvier. These help in the saltatory conduction of nerve impulse.

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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.

Q. Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

Q. Consider the following statements and state true or false.
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.

Q. Assertion :Myelin sheath insulates nerve fibre and prevents its depolarization Reason: Nerve impulses are conducted more rapidly in non-myelinated fibres than myelinated ones

Q. Assertion :Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason: This is due to the absence of nissl's bodies in node of Ranvier.

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