Identify the following parts of the brain from their descriptions.
X - It is the part of fore brain and nearly two third of the human brain contains X.
Y- It is the canal that passes through mid brain
Z-It is the posterior most part of the brain where it merges with the spinal cord. It acts as a coordination pathway for both ascending and descending nerve tracts.

Explanation

To identify the parts of the brain based on the provided descriptions, we can break down the information step by step:

### Step 1: Identify Part X
- **Description**: "It is the part of the forebrain and nearly two-thirds of the human brain contains X."
- **Analysis**: The forebrain is the largest part of the brain and is responsible for higher brain functions such as thought and action. It consists of two hemispheres and is involved in complex processes.
- **Conclusion**: **Part X is the Cerebrum**.

### Step 2: Identify Part Y
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