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Neurophysiology Of Pain | El Paso, TX. | Part II

Neurophysiology: There are two ways that nociceptive information reaches the central nervous system. One is the neospinothalamic tract for quick pain and two is the paleospinothalamic tract for slow pain that increases.

Neurophysiology Of Pain Part II

Intensity, Location & Quality of Pain…

… involve Spinothalamic and Trigeminal Pathways

  • The trigeminal pathway brings information from the face area.
  • The spinothalamic pathway brings information from the rest of the body.
  • Both these pathways project to the sensory cortex, which also receives information on innocuous stimuli such as touch, pressure and warmth via a separate pathway.

2 Pain Transmission Pathways For Location Intensity Quality

neurophysiology el paso tx.Neuroscience Purves et al.

  • Spinothalamic pathway
  • (Anterolateral Pathway)
  • Trigeminal pathway

Unpleasant Quality & Autonomic Affective Motivational Pathway For Pain

neurophysiology el paso tx.Brain Areas Involved In Processing Of Nociceptive Signals

neurophysiology el paso tx.The Anterior Cingulate & Insula Cortex Are Activated In Human Subjects

… in connection with an intense burning sensation following hand contact with the thermal grill.

neurophysiology el paso tx.Adapted from Craig et al. 1994, 1996. From Principles of Neural Science, Kandell et al.

Control Of Pain Perception

  • There is difference between the objective and subjective aspects of injury and pain.
  • Despite similar injury, people can differ in how much pain they feel.
  • Depending on the context, pain may not be felt despite injury, e.g. battlefield injury, during intense sports.
  • This suggests that there is a physiological mechanism that controls the transmission of nociceptive signals to the brain or modifies the interpretation of pain.
  • The pain control system can also explain the placebo effect.

Pain Modulation Pathway

  • Nerve signals are sent form the somatic sensory cortex and hypothalamus to the periaqueductal gray matter (PAG).
  • PAG sends signals to the parabrachial nucleus, medullary reticular formation, locus coeruleus, and Raphe neulei.
  • These in turn can control the in the transmission of nociceptive signals from the spinal cord to the brain.
  • This involves different involves different neurotransmitters.

neurophysiology el paso tx.

Endogenous Opioids

Internally produced molecules with opioid-like action which regulate transmission of nociceptive signals.

Three classes of these molecules have been identified. All are peptide molecules

  1. Enkephalins
  2. Endorphins
  3. Dynorphins

Despite these being powerful, endogenous modifiers of nociceptive signals, it has been difficult to produce and administer them in a way than can used in clinical practice.

Location Of Nerve Cells With Endogenous Opioid Receptors

  • Spinal cord, Medulla, Periaqueductal gray matter (PAG)
  • In the spinal cord, endogenous opioids can prevent transmission between 1st order nerve cells (bringing signals from the periphery) and 2nd order spinal nerve cells that transmit the signals to the brain.
  • Also can prevent the increased synaptic efficiency, which plays a role in hyperalgesia.

neurophysiology el paso tx.

(Center for Brain Research, Uni Vienna)

Modulation Of Pain Signal Transmission In The Spinal Cord

Connections in the spinal cord where opiates act.

Neurotransmitters – serotonin (5- HT) and norephinephrine (noradrenaline) – in the spinal cord can block transmission of pain signals to the brain.

neurophysiology el paso tx.Inflammatory Soup – Hyperalgesia

  • Tissue damage results in the release of a number of chemicals.
  • These increase nociceptors’ response to a stimulus (=hyperalgesia) & produce inflammation.
  • Hyperalgesia = when the magnitude of the response to a nociceptive stimulus is higher than normal.

neurophysiology el paso tx.Julius-D & Basbaum-AI, Nature 2001;413:203

Clinical Application

  • Knowing the molecules involved in the “inflammatory soup” and how they are synthesized provides possible targets for pain reduction.
  • e.g. prostaglandins are produced by the COX enzyme. The activity of this enzyme is blocked by non-steroidal anti- inflammatory drugs (NSAIDs) such as ibuprofen, diclofenac.

Allodynia

  • A condition when normally non- painful stimuli cause pain, e.g., touch, light pressure, cold.
  • Involves changes in the synaptic sensitivity of the nociceptive neurons in the spinal cord (central sensitization).
  • Drugs such as ketamine, block NMDA receptors and so reduce transmisison of the nociceptive stimuli.

neurophysiology el paso tx.Gate Control Theory of Pain

  • Mother says to child, “Come I will rub the area which is painful and this will make it feel better.”
  • After stubbing a toe, we instinctively rub the area; this reduces the sensation of pain.
  • Ronald Melzack and Patrick Wall in 1962 provided an possible explanation for this effect.

Ascending Tracts | Pain Modulation: Gate Control Theory

Gate Theory

Rubbing the area that hurts stimulates receptors of innocuous stimuli like touch, pressure and vibration.

These mechano-receptors send signals along the A? nerve fibers that:

(1) stimulate spinal nerves (inhibitory inter-neurons) that in turn inhibit signaling in the 2nd order neurons (projection neuron) and (2) directly inhibit the 2nd order neuron to reduce or stop pain signal from being sent to the brain

neurophysiology el paso tx.wikidoc.org/images/f/fe/Gate_control_A_firing.png

Clinical Application

Transcutaneous Nerve Stimulation (TENS) is based on the Gate Control Theory. Nerves of the innocuous sensory system are stimulated and they in turn, inhibit transmission of nociceptive stimuli in the spinal cord.

neurophysiology el paso tx.Abnormalities Of Pain System

Phantom Pain

  • Patients with amputation often have burning or tingling pain in the body part removed.
  • One possible cause is that nerve fibers at the stump are stimulated and the brain interprets the signals as originating in the amputated portion.
  • The other is the rearrangement within the cortical areas so that area say for the hand now responds to signals from other parts of the body but still interprets them as coming for the amputated hand.

neurophysiology el paso tx.Peripheral Sensitization

  • Peripheral sensitization represents a reduction in the threshold and/or an increase in magnitude of responsiveness at the peripheral ends of sensory nerve fibers.
  • This occurs in response to chemical mediators released by nociceptors and non-neuronal cells (e.g. mast cells, basophils, platelets, macrophages, neutrophils, endothelial cells, keratinocytes and fibroblasts) at the site of tissue injury or inflammation.
  • Basically, it is an increased sensitivity to an afferent nerve stimuli.

Central Sensitization

Peripheral & Central Sensitisation

  • A condition of the nervous sytem that is associated with the development and maintenance of chronic pain.
  • Known as “wind-up” or persistent high reactivity.
  • “Plastiticity in pain pathways” or the persistence of pain even after an injury has healed.
  • Is this negative or positive plasticity?

neurophysiology el paso tx.

neurophysiology el paso tx.

Central Sensitization & C Fibers

Two Main Characteristics Of Central Sensitization:

Allodynia – occurs when a person experiences pain with things that are normally not painful, ie, soft touch causes pain.

Hyperalgesia – occurs when a stimulus that is typically painful is perceived as more painful that it should be, ie, a simple bump.

Both are due to hyperreactivity of the nervous system.

neurophysiology el paso tx.

neurophysiology el paso tx.Somatosensory Cortex Organization

neurophysiology el paso tx.Cortical Reorganization

neurophysiology el paso tx.Neuroscience. 2nd edition. Purves D, Augustine GJ, Fitzpatrick D, et al., editors. Fig 25.14

Referred Pain

  • Often originates from a visceral organ.
  • May be felt in a part of the body remote from the site of the pathology.
  • The mechanisms may be spinal convergence of visceral and somatic afferent fibers on spinothalamic neurons.
  • Common manifestations: cutaneous and deep hyperalgesia, tenderness, muscular contractions.

Pain Sensation Referred From Visceral Organs …

… to another part of the body surface

neurophysiology el paso tx.

Pain Hypersensitivity Mechanisms At A Glance

neurophysiology el paso tx.

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Professional Scope of Practice *

The information herein on "Neurophysiology Of Pain | El Paso, TX. | Part II" is not intended to replace a one-on-one relationship with a qualified health care professional or licensed physician and is not medical advice. We encourage you to make healthcare decisions based on your research and partnership with a qualified healthcare professional.

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Our information scope is limited to Chiropractic, musculoskeletal, acupuncture, physical medicines, wellness, contributing etiological viscerosomatic disturbances within clinical presentations, associated somatovisceral reflex clinical dynamics, subluxation complexes, sensitive health issues, and/or functional medicine articles, topics, and discussions.

We provide and present clinical collaboration with specialists from various disciplines. Each specialist is governed by their professional scope of practice and their jurisdiction of licensure. We use functional health & wellness protocols to treat and support care for the injuries or disorders of the musculoskeletal system.

Our videos, posts, topics, subjects, and insights cover clinical matters, issues, and topics that relate to and directly or indirectly support our clinical scope of practice.*

Our office has reasonably attempted to provide supportive citations and has identified the relevant research studies supporting our posts. We provide copies of supporting research studies available to regulatory boards and the public upon request.

We understand that we cover matters that require an additional explanation of how it may assist in a particular care plan or treatment protocol; therefore, to further discuss the subject matter above, please feel free to ask Dr. Alex Jimenez, DC, or contact us at 915-850-0900.

We are here to help you and your family.

Blessings

Dr. Alex Jimenez DC, MSACP, RN*, CCST, IFMCP*, CIFM*, ATN*

email: coach@elpasofunctionalmedicine.com

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Disclaimer *

The information herein is not intended to replace a one-on-one relationship with a qualified health care professional, licensed physician, and is not medical advice. We encourage you to make your own health care decisions based on your research and partnership with a qualified health care professional. Our information scope is limited to chiropractic, musculoskeletal, physical medicines, wellness, sensitive health issues, functional medicine articles, topics, and discussions. We provide and present clinical collaboration with specialists from a wide array of disciplines. Each specialist is governed by their professional scope of practice and their jurisdiction of licensure. We use functional health & wellness protocols to treat and support care for the injuries or disorders of the musculoskeletal system. Our videos, posts, topics, subjects, and insights cover clinical matters, issues, and topics that relate to and support, directly or indirectly, our clinical scope of practice.* Our office has made a reasonable attempt to provide supportive citations and has identified the relevant research study or studies supporting our posts. We provide copies of supporting research studies available to regulatory boards and the public upon request.

We understand that we cover matters that require an additional explanation of how it may assist in a particular care plan or treatment protocol; therefore, to further discuss the subject matter above, please feel free to ask Dr. Alex Jimenez or contact us at 915-850-0900.

Dr. Alex Jimenez DC, MSACP, CCST, IFMCP*, CIFM*, ATN*

email: coach@elpasofunctionalmedicine.com

phone: 915-850-0900

Licensed in Texas & New Mexico *

Dr. Alex Jimenez DC, MSACP, CIFM, IFMCP, ATN, CCST
My Digital Business Card

Post Disclaimer

Professional Scope of Practice *

The information herein on "Revolutionizing Healthcare | El Paso, Tx (2023)" is not intended to replace a one-on-one relationship with a qualified health care professional or licensed physician and is not medical advice. We encourage you to make healthcare decisions based on your research and partnership with a qualified healthcare professional.

Blog Information & Scope Discussions

Our information scope is limited to Chiropractic, musculoskeletal, acupuncture, physical medicines, wellness, contributing etiological viscerosomatic disturbances within clinical presentations, associated somatovisceral reflex clinical dynamics, subluxation complexes, sensitive health issues, and/or functional medicine articles, topics, and discussions.

We provide and present clinical collaboration with specialists from various disciplines. Each specialist is governed by their professional scope of practice and their jurisdiction of licensure. We use functional health & wellness protocols to treat and support care for the injuries or disorders of the musculoskeletal system.

Our videos, posts, topics, subjects, and insights cover clinical matters, issues, and topics that relate to and directly or indirectly support our clinical scope of practice.*

Our office has reasonably attempted to provide supportive citations and has identified the relevant research studies supporting our posts. We provide copies of supporting research studies available to regulatory boards and the public upon request.

We understand that we cover matters that require an additional explanation of how it may assist in a particular care plan or treatment protocol; therefore, to further discuss the subject matter above, please feel free to ask Dr. Alex Jimenez, DC, or contact us at 915-850-0900.

We are here to help you and your family.

Blessings

Dr. Alex Jimenez DC, MSACP, RN*, CCST, IFMCP*, CIFM*, ATN*

email: coach@elpasofunctionalmedicine.com

Licensed as a Doctor of Chiropractic (DC) in Texas & New Mexico*
Texas DC License # TX5807, New Mexico DC License # NM-DC2182

Licensed as a Registered Nurse (RN*) in Florida
Florida License RN License # RN9617241 (Control No. 3558029)
Compact Status: Multi-State License: Authorized to Practice in 40 States*

Presently Matriculated: ICHS: MSN* FNP (Family Nurse Practitioner Program)

Dr. Alex Jimenez DC, MSACP, RN* CIFM*, IFMCP*, ATN*, CCST
My Digital Business Card