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Related Concept Videos

Sensory Functions of the Skin01:16

Sensory Functions of the Skin

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The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
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Somatosensation01:33

Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Nociception01:44

Nociception

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Quick assessment of quality-of-life in itch: An exploratory validation of the 5-item pruritus life quality.

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Related Experiment Video

Updated: Jul 30, 2025

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
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Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors

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Basic mechanisms of itch.

Laurent Misery1, Ophélie Pierre2, Christelle Le Gall-Ianotto1

  • 1Laboratoire Interactions Neurones-Keratinocytes (LINK), University of Brest, Brest, France; Department of Dermatology and Venereology, University Hospital of Brest, Brest, France.

The Journal of Allergy and Clinical Immunology
|May 18, 2023
PubMed
Summary
This summary is machine-generated.

Pruritus, or itch, involves specialized nerve endings and complex central nervous system processing, often stemming from neuroimmune interactions. Understanding these pathways is key to managing chronic itch conditions.

Keywords:
Pruritusbraincytokineepidermisitchneuroimmuneneuronneuropeptidepruriceptorskinspinal cord

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Area of Science:

  • Neuroscience
  • Immunology
  • Dermatology

Background:

  • Pruritus (itch) is a complex sensation mediated by specialized nerve endings (pruriceptors) in the epidermis.
  • Itch processing involves intricate pathways within the central nervous system and is frequently linked to neuroimmune interactions.

Purpose of the Study:

  • To elucidate the multifaceted mechanisms underlying pruritus.
  • To identify key mediators and molecular players involved in itch signaling.

Main Methods:

  • Review of scientific literature on pruritus mechanisms.
  • Analysis of the roles of various signaling molecules and ion channels in itch perception.

Main Results:

  • Histamine is implicated in a subset of itchy conditions, while numerous other mediators, including cytokines (e.g., IL-4, IL-31), neurotransmitters, and neurotrophins, are crucial.
  • Ion channels (e.g., TRPV1, TRPM8) and specific receptors (PAR-2, MrgprX2) are vital components of nonhistaminergic itch pathways.
  • Sensitization of peripheral and central pruriceptive neurons contributes significantly to chronic itch.

Conclusions:

  • Pruritus is a complex sensory and neurological phenomenon driven by a diverse array of mediators and signaling pathways.
  • Understanding neuroimmune interactions and neuronal sensitization is critical for developing effective treatments for chronic itch.