Name the structure that holds the cerebral hemispheres together.

Explanation

To answer the question "Name the structure that holds the cerebral hemispheres together," we can follow these steps:

1. **Identify the Cerebral Hemispheres**: The human brain is divided into two halves known as the cerebral hemispheres, which are the left and right hemispheres.

2. **Understand the Separation**: These hemispheres are separated by a deep groove known as the longitudinal cerebral fissure. This fissure runs along the midline of the brain.

3. **Locate the Connecting Structure**: At the base of the longitudinal cerebral fissure, there is a thick bundle of nerve fibers.

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