Nervous system

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  • Created by: Anjelala
  • Created on: 13-03-17 14:13
Functions of nervous system
Senses change, Sends info to the brain, Interprets the info ( known as integration )
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What is the central nervous system?
Brain and spinal cord
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2 principle parts of the nervous system?
-Central nervous system -Peripheral nervous system
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what is the central nervous system ?
Brain and spinal cord
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Function of central nervous system?
Carries out integration and control
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Function of peripheral nervous system?
Consists mainly of nerves that extend from the brain and spinal cord
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What is the peripheral nervous system further divided into ?
-Sensory ( afferent ) division.
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What does the sensory division pass towards?
The brain and spinal cord.
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Where does the motor division pass away from?
The brain and spinal cord
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What is another word for the motor division ?
Efferent division
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What is the motor division further divided into ?
1)Autonomic nervous system 2)Somatic nervous system
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What is the Peripheral nervous system ?
Nerves and Ganglia
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Define the term autonomic
- Under involuntary control
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Explain the autonomic concept
- Conducts impulses from the central nervous system to cardiac muscle, smooth muscle and glands.
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What is th eAutonomic nervous system divided into ?
-Sympathetic division
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What doe the sympathetic division do ?
Mobilises body systems during emergency situations ( Flight and Flight)
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What is the parasympathetic division? What does it do ?
- Conserves energy , promotes non emergency functions
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Define the term somatic?
Under voluntary control .
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What are Nervous tissues formed by?
Two main families of cells. 1) Neurones 2) Neuroglia
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What are the four Neuroglia of the central nervous system?
1)Astrocytes 2)Microglia 3)Ependymal cells 4)Oligodendrocytes
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Role of Astrocytes?
Key role in transport of nutrients and neurotransmitters in the nervous system.
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Role of Microglia ?
Protects cells of the nervous system, have a phagocytic action.
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Role of Ependymal cells ?
Forms barrier between the brain tissue and cerebro- spinal fluid
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Role of Oligodendrocytes?
Forms the myelin sheath which surrounds some neurons.
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What does SSRI stand for ?
Selective serotonin reuptake inhibitor .
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What are SSRI drugs?
Family of antidepressant drugs.
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What do Neurons do ? ( Very simple)
Conducts messages in the form of electrical impulses from regions of the body.
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What is the gap at the end the axon called?
- A synapse.
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What are neurons in their resting state referred to as?
- Resting potential
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What is the resting membrane potential of a neuron?
-70 millivolts
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Define what the resting membrane potential is ?
- Difference between overall negative charge inside the membrane, compared with outside the membrane.
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When are Action potentials generated?
- When the neurons respond to changes in ion concentration.
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What is another term for Action potential ?
Nerve impulse
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What is Myelin ?
Lipid based chemical that surrounds axon
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What do Myelinated axons do ?
Conduct nerve impulse more rapidly than unmyelinated axons.
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What occurs at the synapse?
Electrical message is converted into a chemical message in the form of a neurotransmitter.
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