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Quiz yourself on Nervous SystemGet your flashcardsBuild my revision planTrack my progress🧠 Brain Structure
The brain is the most complex organ in the body. For GCSE, you need to know the functions of three main regions. Think of the brain as a company:
- The cerebrum is the CEO — it makes all the big decisions.
- The cerebellum is the production manager — it coordinates all the physical actions.
- The medulla oblongata is the maintenance team — it keeps essential systems running without you even thinking about it.
The three brain regions:
| Brain Region | Location | Function |
|---|---|---|
| Cerebral cortex (cerebrum) | Largest part; wrinkled outer layer | Consciousness, intelligence, memory, language, and voluntary actions |
| Cerebellum | Lower back of the brain | Muscle coordination, balance, and posture — makes movements smooth rather than jerky |
| Medulla oblongata | Base of the brain, connects to spinal cord | Controls unconscious activities: heart rate, breathing rate, and blood pressure |
Why is the brain difficult to study?
The brain is incredibly complex, with billions of interconnected neurones. It is also very delicate — even small amounts of damage can cause major problems. Treating brain damage is extremely difficult because neurones in the brain rarely divide or regenerate. Scientists use brain scanning techniques such as CT scans, PET scans, and MRI scans to map which parts of the brain control different functions, but our understanding is still limited.
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