Questions: QUESTION 7 Which structure predominates in the white matter of the brain? ganglia of the parasympathetic nerves bundles of dendrites from the enteric nervous system neuronal cell bodies myelinated axons oligodendrocytes

The answer is the fourth one: myelinated axons.

Explanation for each option:

1. Ganglia of the parasympathetic nerves: This is incorrect. Ganglia are clusters of neuronal cell bodies found in the peripheral nervous system, not in the white matter of the brain.

2. Bundles of dendrites from the enteric nervous system: This is incorrect. The enteric nervous system is part of the peripheral nervous system and is primarily associated with the gastrointestinal tract, not the brain's white matter.

3. Neuronal cell bodies: This is incorrect. Neuronal cell bodies are primarily found in the gray matter of the brain, not the white matter.

4. Myelinated axons: This is correct. The white matter of the brain is predominantly composed of myelinated axons, which are responsible for transmitting signals between different parts of the brain and between the brain and the spinal cord.

5. Oligodendrocytes: This is incorrect. While oligodendrocytes are present in the white matter and are responsible for myelinating axons, they are not the predominant structure. The myelinated axons themselves are the main component.

In summary, the white matter of the brain is primarily made up of myelinated axons, which facilitate communication within the nervous system.