Cerebral hemispheres of mammals consist of

Options

A. Outer gray matter and central white matter
B. Outer white matter and central gray matter
C. Gray matter and white matter inter mingled
D. Gray matter only

Answer

To answer the question "Cerebral hemispheres of mammals consist of?", we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Cerebral Hemispheres**:
- The cerebral hemispheres are the largest part of the brain and are divided into two halves. They play a crucial role in various functions including sensory perception, motor control, and cognitive abilities.

2. **Identifying the Composition**:
- The cerebral hemispheres consist of two main types of brain tissue: gray matter and white matter.
- **Gray Matter**: This is the outer layer of the cerebral hemispheres. It contains the cell bodies of neurons, dendrites, and unmyelinated axons. It is primarily involved in processing and interpreting information.
- **White Matter**: This is found beneath the gray matter and consists mainly of myelinated axons. It is responsible for transmitting signals between different parts of the brain and between the brain and spinal cord.

3. **Analyzing the Options**:
- **Option 1**: Outer gray matter and central white matter. This is correct as it accurately describes the arrangement of gray and white matter in the cerebral hemispheres.
- **Option 2**: Outer white matter and central gray matter. This is incorrect because the gray matter is not located centrally.
- **Option 3**: Gray matter and white matter intermingled. This is also incorrect as they are distinctly layered.
- **Option 4**: Gray matter only. This is incorrect because it ignores the presence of white matter.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option 1: Outer gray matter and central white matter**.