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The brain

Homeostasis and response · The human nervous system · note 4 of 8

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The brainSpec 4.5.2.2

The brain controls complex behaviour. It is made of billions of interconnected neurones and has different regions that carry out different functions.

Regions of the brain
RegionFunction
Cerebral cortexConsciousness, intelligence, memory and language
CerebellumCoordinates muscular activity and balance
MedullaControls unconscious activities such as heart rate and breathing
Side view of the human brain with the cerebral cortex, cerebellum, medulla and spinal cord labelled.Tap to enlarge
Regions of the brain: the cerebral cortex, the cerebellum and the medulla.
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Investigating the brain and treating brain disorders

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Neuroscientists have mapped regions of the brain to particular functions in three main ways.

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  • Studying patients with brain damage and seeing which abilities are lost.
  • Electrically stimulating different parts of the brain and seeing what happens.
  • Using MRI scanning techniques.
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The complexity and delicacy of the brain makes investigating and treating brain disorders very difficult. It is made of billions of interconnected neurones, and its tissue is easily damaged during investigation or treatment. Any procedure on the brain or nervous system has benefits and risks that must be weighed up.

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