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Brain & spinal cord neurons are not myelinated
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∙ 14y ago
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What surrounds the axon?
Some but not all axons are covered with Schwann's cells which are filled with myelin.
What does myelin sheath wrap around?
The myelin sheath wraps around the around the axon of a neuron. The gaps of the myelin sheath are not insulated and are therefore capable of generating electrical activity.
The layer of lipid around an axon is called?
Myelin sheath
What is the relationship between myelin and the propagation speed of action potentials?
Electrical signals travel faster in axons that are insulated with myelin. Myelin, produced by glial support cells, wraps around axons and helps electrical current flow down the axon (just like wrapping tape around a leaky water hose would help water flow down the hose).Myelin insulation does not cover the entire axon. Rather there are breaks in the wrapping. These breaks are called nodes of Ranvier. The distance between these nodes is between 0.2 and 2 mm.Action potentials traveling down the axon "jump" from node to node. This is called saltatory conduction which means "to leap." Saltatory conduction is a faster way to travel down an axon than traveling in an axon without myelin.
What is the fatty substance that speeds up transmission of impulses and surrounds the axon of a neuron?
The fatty tissue surrounding the axon of a neuron is called myelin.
What are the gaps in the myelin sheath that create non-insulated areas along an axon?
nodes (:I do not disagree with that answer, but I just want to point out that the nodes have a special name. They are called Nodes of Ranvier, named after the man that discovered them (so Ranvier is capitalized). C:
What surrounds the axon?
Some but not all axons are covered with Schwann's cells which are filled with myelin.
What does myelin sheath wrap around?
The myelin sheath wraps around the around the axon of a neuron. The gaps of the myelin sheath are not insulated and are therefore capable of generating electrical activity.
It insulates the axon of the neuron?
An insulating layer that surrounds the axon is a myelin sheath.
The layer of lipid around an axon is called?
Myelin sheath
Where are the nodes of a neuron located?
Between myelin segments surrounding the axon The axon of a neuron is the single long fibre which caries impulses away from the cell body. It is surrounded by a fatty layer, the myelin sheath, produced by Schwann cells arranged along the length of the axon. The gaps between the myelin sheath cells are called nodes of Ranvier. See http://en.wikipedia.org/wiki/Axon for more information and a diagram. easy answer between the myelin segments surrounding the axon b. between myelin segments surrounding the axon
What is the definition of myelin sheath?
A myelin sheath is a layer of myelin (a dielectric, or electric insulator) around the axon of a neuron.
The Schwann cell forms a myelin sheath around the?
axon of a neuron in the peripheral nervous system.Schwann cells form a myelin sheath around the Axon.
What is the relationship between myelin and the propagation speed of action potentials?
Electrical signals travel faster in axons that are insulated with myelin. Myelin, produced by glial support cells, wraps around axons and helps electrical current flow down the axon (just like wrapping tape around a leaky water hose would help water flow down the hose).Myelin insulation does not cover the entire axon. Rather there are breaks in the wrapping. These breaks are called nodes of Ranvier. The distance between these nodes is between 0.2 and 2 mm.Action potentials traveling down the axon "jump" from node to node. This is called saltatory conduction which means "to leap." Saltatory conduction is a faster way to travel down an axon than traveling in an axon without myelin.
The speed of impulse conduction along an axon may be increased by?
By myelin sheath.
What does the sheath do around the axon?
Protects the axon. The "Myelin Sheath" serves as an insulator to protect nerves.
What is the fatty substance that speeds up transmission of impulses and surrounds the axon of a neuron?
The fatty tissue surrounding the axon of a neuron is called myelin.
