10.2 Neurones

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  • Created by: Molly
  • Created on: 10-03-14 10:39
What are neurones?
Specialised cells adapted to carrying nerve impulses from one part of the body to another.
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What does the cell body contain?
A nucleus and large amounts of rough endoplasmic reticulum for proteinsynthesis and neurotransmitters
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What are dendrons?
They are small extensions of the cell body which subdivide into smaller branched fibres called dendrites.
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What direction do dendrons carry nerve impulses?
Towards the cell body.
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What are the Schwann cells?
They surround the axon, protect it and provide electrical insulation.
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What is the myelin sheath and what is it made of?
It is a cover to the axon and is made up of the membranes of Schwann cells.
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Which neurones transmit nerve impulses the fastest?
Myelinated.
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What are the nodes of ranvier
Gaps between adjacennt Schwann cells where there is no myelin sheath.
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What do sensory neurones do?
Transmit nerve impulses from a receptor to an intermediate or motor neurone. They have one dendron that carries the impulse towards the cell body and one axon that carries it away from the cell body.
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What do motor neurones do?
They transmit nerve impulses from an intermediate or sensory neurone to an effector, such as a gland or a muscle. They have a long axon and many short dendrites.
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What do intermediate neurones do?
They transmit impulses between neurones.
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Other cards in this set

Card 2

Front

What does the cell body contain?

Back

A nucleus and large amounts of rough endoplasmic reticulum for proteinsynthesis and neurotransmitters

Card 3

Front

What are dendrons?

Back

Preview of the front of card 3

Card 4

Front

What direction do dendrons carry nerve impulses?

Back

Preview of the front of card 4

Card 5

Front

What are the Schwann cells?

Back

Preview of the front of card 5
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