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The myelin sheath. Due to its insulating properties, the myelin sheath prevents the movement of ions in nerve cells. Therefore nervous impulses will jump between the gaps in the myelin sheath (called the Nodes of Ranvier). This is a lot quicker than the conduction in non-myelinated nerve fibres which occurs by the movement of ions across each of the nerve cell membranes.

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15y ago
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13y ago

Insulation of axon is achieved by the "Myelin sheath"which covers the axon intermittently, with gaps called "nodes of Ranvier". This insulation causes action potential to jump from one node of Ranvier to the next.

For PNS = the myelin sheath is made by the Schwann cells

For CNS= the myelin sheath is made by the Oligodendrocytes

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9y ago

The myelin sheath is the layer of fat cells that insulates most axons and speeds up the transmission of nerve impulses.

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12y ago

Neurilemma sheath/myelin sheath

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12y ago

Myelin Sheath

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Q: What is the insulating layer wrapped around nerve cells that increases the speed of nerve impulse transmission?
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