The sensation produced by a wisp of cotton on one’s fingeip is mediated by the:
## Core Concept
The sensation produced by a wisp of cotton on one's fingertip is related to the detection of light touch. This type of sensation is primarily mediated by specific mechanoreceptors in the skin. The detection of light, gentle touch is crucial for various daily activities and spatial awareness.
## Why the Correct Answer is Right
The correct answer, , involves the **Meissner's corpuscles**. These are rapidly adapting mechanoreceptors found in the skin, particularly abundant in areas sensitive to light touch such as the fingertips, palms, soles, eyelids, tongue, and lips. They are responsible for detecting changes in texture and low-frequency vibration, which essentially translates to the sensation of light touch, such as that produced by a wisp of cotton.
## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because it does not correspond to the correct type of receptor or pathway associated with light touch sensation.
* **Option B:** This is incorrect as it does not accurately represent the mechanoreceptor responsible for the described sensation.
* **Option D:** This option is incorrect because it does not correctly identify the receptor or mechanism through which light touch sensations are mediated.
## Clinical Pearl / High-Yield Fact
A key point to remember is that different types of mechanoreceptors are responsible for various sensations:
- **Meissner's corpuscles** for light touch and changes in texture,
- **Pacinian corpuscles** for deep pressure and high-frequency vibration,
- **Merkel's discs** for pressure and light, sustained touch,
- **Ruffini's corpuscles** for skin stretch and slip.
## Correct Answer: . Meissner's corpuscles