the portion of cerebrum which is greyish in appearance is

Answer

**Step-by-Step Solution:**

1. **Identify the Structure**: The question asks about a specific portion of the cerebrum that appears grayish in color.

2. **Understand Cerebrum Composition**: The cerebrum is divided into two main regions: the outer region and the inner region.

3. **Outer Region - Gray Matter**: The outer region of the cerebrum is known as the gray matter. This area is characterized by its grayish appearance.

4. **Composition of Gray Matter**: The gray matter consists primarily of neural cell bodies and unmyelinated (or non-myelinated) axons. This lack of myelin sheath contributes to its gray color.

5. **Inner Region - White Matter**: In contrast, the inner region of the cerebrum is referred to as the white matter, which consists of myelinated axons. The presence of the myelin sheath gives this region a white appearance.

6. **Conclusion**: Therefore, the portion of the cerebrum that is grayish in appearance is the gray matter, which is located on the outer surface of the cerebrum.

**Final Answer**: The portion of the cerebrum which is grayish in appearance is the **gray matter**.

---