14.4- Receptors (Pacinian corpuscle)

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  • Created by: Megan2413
  • Created on: 07-11-17 13:14
What are the two main feautures of sensory recpetion?
- It is specific to a type of stimulus (e.g. Heat, light, mechanical pressure) - Tey produce generator potentials by acting as transducers
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What is a transducer?
It is a receptor that converts energy from a stmulus into a nervous impulse
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What is a generator potential?
The nervous impulse which is generated from the energy of a stimulus
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From what type of energy does the pacinian corpuscle transduce into a generator potential?
Mechanical energy
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What is the pacinian corpuscle and where is it found?
It is a receptor that responds to changes in mechanical pressure. It is found deep in the skin and most abundant on fingers but can also occur in joints, ligaments and tendons
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Describe the structure of the pacinian corpuscle
The single sensory neurone is at the centre of the pacinian corpuscle and surrounding the neurone ending is layers of tissue each separated by viscous gel which is contained in a capsule
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What is the name of the sodium channel within the plasma membrane of the sensory neurone?
Stretch-mediated sodium channel
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What happens to the stretch-mediated sodium channel when it is deformed?
It's permeability to sodium ions changes
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Describe how the pacinian corpuscle functions
- During resting state the stretch-mediated sodium channels are too narrow to allow Na+ ions through and the pacinian corpuscle has a resting potential - When pressure is applied to the pacinian corpuscle it is deformed and the stretch-mediated -->
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sodium channels are stretched hence widening them which allows Na+ ions to diffuse into the neurone - The influx of sodium ions changes the potential of the mebrane and depolarises it, thereby producing a generator potential - The generator -->
potential in turn creates an action potential (nerve impulse)
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How are the charges distributed across the membrane witha resting potential?
The inside of the neurone is negatively charged and the other side of the membrane is positively charged - it is polar
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How are the charges distributed across the membrane with a generator potential?
The inside of the neurone is positively charged and the otheside of the membrane is negatively charged
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What is a transducer?

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It is a receptor that converts energy from a stmulus into a nervous impulse

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What is a generator potential?

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From what type of energy does the pacinian corpuscle transduce into a generator potential?

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What is the pacinian corpuscle and where is it found?

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