Pacinian corpuscles which occur in the skin are

Options

A. Free sensory nerve endings
B. Specialised cells at the end of the sensory nerve fibre
C. A type of gland
D. Encapsulated pressure receptors deep in the dermis

Answer

**Step-by-Step Solution:**

1. **Understanding Pacinian Corpuscles**:
- Pacinian corpuscles, also known as lamellar corpuscles, are specialized mechanoreceptors found in the skin and other tissues. They are responsible for detecting pressure and vibration.

2. **Location**:
- These corpuscles are primarily located deep within the dermis layer of glabrous (hairless) skin, such as the palms of the hands and soles of the feet.

3. **Structure**:
- Pacinian corpuscles have a unique structure that consists of concentric layers of connective tissue surrounding a nerve ending. This encapsulated structure allows them to respond to changes in pressure and vibration.

4. **Function**:
- As mechanoreceptors, Pacinian corpuscles are sensitive to mechanical stimuli. When pressure is applied, they generate nerve impulses that are sent to the brain, allowing us to perceive sensations of pressure and vibration.

5. **Comparison with Other Sensory Receptors**:
- Unlike free sensory nerve endings that are not encapsulated, Pacinian corpuscles are encapsulated pressure receptors. They differ from other types of receptors, such as those found in taste buds or glands.

6. **Conclusion**:
- Therefore, the correct characterization of Pacinian corpuscles is that they are encapsulated pressure receptors located in the skin.

**Final Answer**: Pacinian corpuscles are encapsulated pressure receptors found in the skin.

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