How are white and grey matter placed in the brain ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of the Brain**:
- The brain is composed of two main types of tissue: gray matter and white matter.
- Gray matter constitutes approximately 40% of the brain, while white matter makes up about 60%.

2. **Location of Gray Matter**:
- Gray matter is primarily located on the surface of the brain, referred to as the cerebral cortex.
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