The probable reason for the greyish appearance of cerebral cortex is

Options

A. Presence of bundles of axons in this region
B. the cell body of neuron possess myelin sheath
C. the cell bodies of neuron concentrate here
D. all of the above

Answer

To solve the question regarding the probable reason for the greyish appearance of the cerebral cortex, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Brain Structure**: The brain is composed of two main types of tissue: grey matter and white matter. Grey matter is located on the outer layer of the brain, while white matter is found deeper within.

2. **Identifying Grey Matter Composition**: The grey matter primarily consists of neuronal cell bodies, dendrites, and unmyelinated axons. This is where the majority of synaptic connections occur.

3. **Examining the Appearance**: The greyish color of the cerebral cortex is attributed to the presence of these neuronal cell bodies. Unlike white matter, which contains myelinated axons that appear white, the grey matter lacks this myelin and thus has a greyish hue.

4. **Analyzing the Options**:
- Option 1: Presence of bundles of axons in this region - This is incorrect because bundles of axons are found in white matter, not grey matter.
- Option 2: The cell body of neuron possesses myelin sheath - This is also incorrect as the cell bodies do not have myelin sheaths; myelin is found on axons.
- Option 3: The cell bodies of neurons concentrate here - This is correct as the concentration of neuronal cell bodies in the grey matter gives it the greyish appearance.
- Option 4: All of the above - This is incorrect since options 1 and 2 are wrong.

5. **Conclusion**: Therefore, the correct answer is that the greyish appearance of the cerebral cortex is due to the concentration of the cell bodies of neurons in this region.

### Final Answer:
The probable reason for the greyish appearance of the cerebral cortex is the concentration of the cell bodies of neurons.

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