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Neuron

What exactly ...

Question

What exactly is the white matter of spinal cord made up of ?

A

Myelinated dendrite

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B

Myelinated nerve cell

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C

Dura mater

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D

Pia mater

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Solution

The correct option is B
Myelinated nerve cell

White matter is composed of bundles of myelinated nerve cell processes or axons. The axons connect various grey matter areas of the brain to each other and carry nerve impulses in-between neurons.

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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.

State whether the following statements are true (T) or false (F).

(a) The main component of the white matter of the brain is perikaryon. (T/F)

(b) The arachnoid layer fits closely inside the pia mater (T/F)

(c) A double chain of ganglia, on eon each side of the nerve cord belongs to the spinal cord. (T/F)

(d) Dura mater is the outermost layer of the meninges. (T/F)

Q. State whether the following statements are true (T) or false (F).
(a) The main component of the white matter of the brain is perikaryon. (T/F)
(b) The arachnoid layer fits closely inside the pia mater. (T/F)
(c) A double chain of ganglia, one on each side of the nerve cord belongs to the spinal cord. (T/F)
(d) Dura maters the outermost layer of the meninges. (T/F)

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 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.

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