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Myelin

Definition

noun

A substance comprised mainly of fatty material (about 80%) and proteins (about 20%), and forms the myelin sheath that surrounds the axons of some nerve cells.


Supplement

Nerve cells in which the axon is covered with myelin sheath are found in the white matter of the central nervous system. The myelin is assumed to be the substance that renders this part of the central nervous system white in color.


Word origin: myelin, from Greek myelos ", marrow.

Variant: myeline

Synonym:

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Does other animals have faster nerve speeds?

The speed of nerve transmission depends on the size of the nerve axon, the length of it and whether it is effectively insulated by myelin. There are a vast number of different kinds of neurons in each animal, and for some there are more of the nice big, insulated ones for processes that ...

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by Babybel56
Fri Feb 28, 2014 8:55 am
 
Forum: General Discussion
Topic: Does other animals have faster nerve speeds?
Replies: 1
Views: 1361

Why do neurones only have one axon?

... of a nerve impulse and the answer to this i do not believe to be yes because neurones are insulated ( some are anyway) with a substance called myelin this enables very fast transmission and has gaps at regular intervals called nodes of ranvier where diffusion of ions can occur. If we had lots ...

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by Drredfrizzle
Sun Nov 11, 2012 7:46 pm
 
Forum: Human Biology
Topic: Why do neurones only have one axon?
Replies: 1
Views: 2531

Evolution of the nervous system

... since the nerves cannot reach out to all vital body parts. The nerves outside the spinal cord and the skull are however slightly protected by the myelin, which is made of lipids from protein. Is my hypothesis correct? If not, please explain the correct theory. Thank you in advance!

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by Anna55
Sun Nov 06, 2011 1:40 pm
 
Forum: Evolution
Topic: Evolution of the nervous system
Replies: 14
Views: 7029

Re: Difference between Schwann's Cells, myelin sheath and...

The Schwann cells covers strongly about the axon. Where the central nervous system the myelin is established by oligodendrocytes, it is a glial cells in the brain... 8)

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by philipsteele
Sat Jun 18, 2011 6:51 am
 
Forum: Human Biology
Topic: Difference between Schwann's Cells, myelin sheath and...
Replies: 3
Views: 15372

Difference between Schwann's Cells, myelin sheath and...

Schwan cells produce myelin sheath but are found in peripheral neurons only, the neurons of CNS are derived from Oligodendrocytes. I hope it's a bit clear now.

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by AKumar
Fri Jun 17, 2011 7:07 pm
 
Forum: Human Biology
Topic: Difference between Schwann's Cells, myelin sheath and...
Replies: 3
Views: 15372
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