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Related Concept Videos

Analgesia and Pain Management01:25

Analgesia and Pain Management

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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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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Peripherally and Centrally Acting Muscle Relaxants: A Comparison01:09

Peripherally and Centrally Acting Muscle Relaxants: A Comparison

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Skeletal muscle relaxants can target the central nervous system [CNS] to reduce muscle tension or act directly at the neuromuscular junction to induce temporary paralysis. These two classes of muscle relaxants are called centrally acting muscle relaxants and peripherally acting muscle relaxants. They differ in their action, mechanism, administration route, and clinical uses.
Centrally acting muscle relaxants can be further divided into spasmolytic and antispasmodic drugs. Spasmolytic...
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Pain01:20

Pain

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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...
631
Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

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Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx...
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Centrally Acting Muscle Relaxants: Therapeutic Uses01:24

Centrally Acting Muscle Relaxants: Therapeutic Uses

846
Centrally acting muscle relaxants reduce muscle tone and tension by interfering with the postsynaptic reflexes in the central nervous system.
Centrally acting drugs are classified into spasmolytic and antispasmodic drugs. Spasmolytic drugs such as baclofen, diazepam, and tizanidine inhibit spinal motor neurons and decrease muscle tone. Spasmolytic drugs are administered for severe and chronic spasms due to multiple sclerosis, cerebral palsy, stroke, and spinal cord and muscle injuries. However,...
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Related Experiment Video

Updated: Sep 11, 2025

Manual Therapy for a Chronic Non-Specific Low Back Pain Rat Model
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[Pain modulating systems and manual medicine].

Michaela Habring1, Karl Meßlinger2

  • 1Praxis für Allgemeinmedizin, Bad Ischl, Österreich.

Orthopadie (Heidelberg, Germany)
|August 12, 2025
PubMed
Summary

Pain modulation occurs at multiple levels, from primary afferents to brainstem and cortical pathways. Understanding these endogenous pain control systems is crucial for developing effective pain reduction therapies.

Keywords:
Ascending afferent pathwaysDescending pathwaysManual therapeutic methodsNociceptionPain inhibition

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Area of Science:

  • Neuroscience
  • Pain Research
  • Physiology

Context:

  • Pain perception involves complex modulation within the nociceptive system.
  • Multiple neural levels, including spinal cord, brainstem, and cortex, contribute to pain control.
  • Endogenous opioid systems play a significant role in pain modulation.

Purpose:

  • To elucidate the hierarchical organization of the pain-modulating system.
  • To highlight the interplay between different neural structures in pain processing.
  • To underscore the relevance of these endogenous systems for therapeutic interventions.

Summary:

  • Pain modulation involves primary nociceptive afferents, spinal interneurons, and projection neurons.
  • Descending pathways from brainstem nuclei (periaqueductal gray, locus coeruleus, rostral ventromedial medulla) influence spinal activity.
  • Cortical and limbic areas, along with the hypothalamus, provide descending input, integrating cognitive, emotional, and autonomic aspects of pain.

Impact:

  • Provides a comprehensive overview of the endogenous pain control system.
  • Forms the basis for understanding the mechanisms of various pain reduction therapies.
  • Informs the development of novel therapeutic strategies targeting pain modulation.