Which structure is pure sensory?

Options

A. Ramus dorsalis
B. Dorsal root
C. Spinal nerve
D. Ventral root

Answer

To determine which structure is purely sensory, we need to analyze the given options one by one.

### Step-by-Step Solution:

1. **Evaluate the First Option: Ramus Dorsalis**
- The Ramus Dorsalis serves the dorsal portion of the trunk and contains both sensory and motor fibers.
- **Conclusion**: This option is incorrect because it is not purely sensory.

2. **Evaluate the Second Option: Dorsal Root**
- The Dorsal Root is known to carry sensory information from the body to the spinal cord. It does not contain any motor fibers.
- **Conclusion**: This option is correct as it is purely sensory.

3. **Evaluate the Third Option: Spinal Nerve**
- Spinal Nerves are mixed nerves, meaning they contain both sensory and motor fibers.
- **Conclusion**: This option is incorrect because it is not purely sensory.

4. **Evaluate the Fourth Option: Ventral Roots**
- Ventral Roots contain motor fibers that carry signals from the spinal cord to the muscles.
- **Conclusion**: This option is incorrect as it is not purely sensory.

### Final Answer:
The correct answer is **Dorsal Root**, as it is the only structure that is purely sensory.

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