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Related Concept Videos

Pain01:20

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
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Nociception01:44

Nociception

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. Thus, pain helps the...
Inflammation: Introduction01:28

Inflammation: Introduction

Inflammation is a fundamental, protective biological response of vascularized tissues to cellular injury, infection, or harmful stimuli. Its primary function is to eliminate the initial cause of injury, clear necrotic cells and damaged tissue, and initiate the necessary repair processes.Cardinal SignsAcute inflammation presents with classic signs. Redness results from vasodilation and increased blood flow. Heat is due to increased metabolism and circulation. Swelling results from the...
Introduction to the Integumentary System01:25

Introduction to the Integumentary System

The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
The skin, which is the primary organ of the integumentary system, consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the...
Thermosensation01:43

Thermosensation

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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Related Experiment Video

Updated: Jun 26, 2026

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
04:59

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

Published on: September 27, 2019

Itch and pain.

Martin Schmelz1

  • 1Department Anesthesiology and Intensive Care Medicine, Karl Feuerstein Professorship, Medical Faculty Mannheim, University of Heidelberg, Theodor Kutzer Ufer 1-3, 68167 Mannheim, Germany. martin.schmelz@anaes.ma.uni-heidelberg.de

Neuroscience and Biobehavioral Reviews
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

Research on itch mechanisms is advancing, revealing similarities to pain pathways. This interconnectedness allows for new therapeutic strategies for chronic itch and pain conditions.

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Last Updated: Jun 26, 2026

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
04:59

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

Published on: September 27, 2019

Determining heat and mechanical pain threshold in inflamed skin of human subjects
13:21

Determining heat and mechanical pain threshold in inflamed skin of human subjects

Published on: January 14, 2009

Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
09:16

Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli

Published on: April 5, 2019

Area of Science:

  • Neuroscience
  • Dermatology
  • Pain Research

Background:

  • Pain research is well-established, but itch mechanisms remain less understood.
  • Traditionally, pain and itch were considered antagonistic.

Purpose of the Study:

  • To review itch-specific pathways and modified pattern theory of pruritus.
  • To explore the interconnectedness of itch and pain research.

Main Methods:

  • Literature review of pain and itch research.
  • Analysis of sensitization mechanisms in inflamed tissue and spinal cord.

Main Results:

  • Identified itch-specific pathways and evidence for independent itch induction mechanisms.
  • Observed similar sensitization patterns in both itch and pain pathways.
  • Highlighted the potential for shared therapeutic concepts.

Conclusions:

  • Itch and pain research are increasingly interconnected.
  • Shared mechanisms suggest potential for validating analgesic concepts in chronic itch.
  • Studying skin sensitization may advance nociception concepts in humans.