Piezo2 is a specialized ion channel which opens when mechanically stretched and so depolarizes the cell. Implicated in the response to light touch. This channel is found in both Meissner's corpuscles and Merkel's discs.

Piezo2

Touch, Thermoception, and Nociception. (2019). [Image]. Lumen Learning. https://courses.lumenlearning.com/wmopen-psychology/chapter/reading-touch-and-pain/

Merkel's Discs Image Reference

Given the following scenario, identify the specific type of touch receptor that is most critical for the described task and explain the reasoning behind your choice.

Sensory Perception in Action

Merkel's disks are a type of touch receptor found in the skin that is specialized to respond to light pressure.

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University of Rochester

Tactile receptors detect light touch. There are four types of tactile receptors, which are found primarily in the dermis layer:
- Pacinian Corpuscles
- Meissner Corpuscles
- Merkel's Discs
- Ruffini's Endings

Tactile Receptors

Specialized to detect mechanical forces, including touch, pressure, vibration, and cutaneous tension. There are 4 main cell types:
- Meissner's corpuscles
- Pacinian corpuscles
- Merkel's discs
- Ruffini's endings

These four cell types are referred to as highly sensitive tactile receptors, also referred to as low-threshold mechanoreceptors. 

Mechanoreceptors

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Purves D, Augustine GJ, Fitzpatrick D, et al., editors. Neuroscience. 2nd edition. Sunderland (MA): Sinauer Associates; 2001. Mechanoreceptors Specialized to Receive Tactile Information. Available from: https://www.ncbi.nlm.nih.gov/books/NBK10895/

Mechanoreceptors Specialized to Receive Tactile Information

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Touch and Pain . Lumen. (n.d.). https://courses.lumenlearning.com/wmopen-psychology/chapter/reading-touch-and-pain/. 

Touch and Pain

Meissner's corpuscles are tactile receptors in the skin that are sensitive to pressure and lower-frequency vibrations. This function contributes to the perception of texture and detailed form.

Meissner's Corpuscles

Pacinian corpuscles are receptors in the skin that specialize in detecting transient pressure and high-frequency vibrations.

Pacinian Corpuscles

Merkel's Disks

Ruffini corpuscles, also known as Ruffini's endings, are slow-adapting touch receptors within the skin that are specialized to detect stretch.

Ruffini Corpuscles

A person is blindfolded and asked to identify an object solely by touch. They run their fingers over the object, noting its smooth surface, its defined edges, and the slight vibration as their hand moves. Which of these perceptions is made possible by the class of sensory cells specialized for detecting mechanical forces?

A person holds a vibrating mobile phone while simultaneously tracing a finger across its smooth glass screen to feel for a tiny crack. Which statement best analyzes how the nervous system processes these distinct tactile inputs?

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