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Related Concept Videos

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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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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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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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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Related Experiment Video

Updated: Dec 6, 2025

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

James Meixiong1, Xinzhong Dong2,3, Hao-Jui Weng4,5

  • 1Solomon H. Snyder Department of Neuroscience and Medical Scientist Training Program, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

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Neurologic insults cause neuropathic pain and itch by altering sensory signals to the brain. Understanding the specific itch circuit is crucial for developing effective treatments for these conditions.

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Area of Science:

  • Neuroscience
  • Dermatology
  • Pain Medicine

Background:

  • Neurologic insults like inflammation, stroke, and fibromyalgia can lead to neuropathic pain and itch.
  • Noxious sensations arise from aberrant afferent signaling to cortical neurons, involving increased sensory or decreased inhibitory signaling.
  • Comprehensive knowledge of sensory transmission from the periphery to the cortex is essential for therapeutic development.

Purpose of the Study:

  • To review the mechanisms underlying neuropathic itch.
  • To focus on the specific neural circuits involved in itch sensation.
  • To enhance understanding of receptors, cells, and circuits contributing to neuropathic itch.

Main Methods:

  • Review of molecular, genetic, and behavioral studies in animals and patients.
  • Analysis of sensory transmission pathways.
  • Focus on itch-specific neural circuits.

Main Results:

  • Neuropathic itch and pain share common origins in altered sensory signaling.
  • Specific receptors, cells, and circuits have been identified through various research approaches.
  • Understanding these pathways is key to differentiating and treating itch versus pain.

Conclusions:

  • Detailed knowledge of sensory transmission is vital for treating neuropathic itch and pain.
  • The itch-specific circuit is a critical target for therapeutic interventions.
  • Further research into these circuits promises improved treatments for neuropathic itch.