Pain Sensory Neurons
Pain Sensory Neurons - Related Videos
04:11
Investigating the Origins of Sensory Neurons in the Dura Mater Using Fluorescence Microscopy
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2025
Source: Wang, J., et al. Visualizing the Calcitonin Gene-Related Peptide Immunoreactive Innervation of the Rat Cranial Dura Mater with Immunofluorescence and Neural Tracing. J. Vis. Exp. (2021). This video demonstrates a method to trace the origins of sensory neurons in the dura mater using fluorescence microscopy. A retrograde tracer is introduced into the exposed dura mater of an anesthetized rat. The tracer is taken up by sensory neuronal axons and travels retrogradely to their cell bodies...
01:31
What is a Sensory System?
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2019
Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position. Sensory systems include the visual, auditory, gustatory (taste), olfactory (smell), somatosensory (touch, pain, temperature, and proprioception), and vestibular...
13:11
Sensory Exam
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2023
Source:Tracey A. Milligan, MD; Tamara B. Kaplan, MD; Neurology, Brigham and Women's/Massachusetts General Hospital, Boston, Massachusetts, USA A complete sensory examination consists of testing primary sensory modalities as well as cortical sensory function. Primary sensory modalities include pain, temperature, light touch, vibration, and joint position sense. Sensation of the face is discussed in the videos Cranial Nerves Exam I and II, as are the special senses of smell, vision, taste, and...
17:27
Preparation of Aplysia Sensory-motor Neuronal Cell Cultures
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Cited by 37 •
2009
Primary cultures of Aplysia sensory-motor neurons provide a model preparation for studying synapse formation and synaptic plasticity in vitro. This video demonstrates the identification and microdissection of sensory and motor neurons from Aplysia ganglia as well as the methods for establishing and maintaining sensory-motor neurons in culture.
09:16
Dynamic Quantitative Sensory Testing to Characterize Central Pain Processing
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Cited by 46 •
2017
By assessing pain in response to repetitive or different types of standardized stimuli, dynamic quantitative sensory testing (QST) can reveal changes in the central processing of pain. We present methods to optimize and individualize two dynamic QST measures: temporal summation (TS) and conditioned pain modulation (CPM).
FAQs
Activation begins when mechanical, thermal, or chemical inputs affect ion channels in the neuron. These channels convert the stimulus into electrical activity, which travels along peripheral nerves toward the spinal cord and brain. Because this sequence links detection with signal transmission, pharmacological interventions can be examined according to whether they reduce activation, interrupt propagation, or modify later pain processing.
Ion channels provide the molecular step that couples a potentially damaging stimulus to an electrical impulse. Their activity determines whether the neuron responds to mechanical, thermal, or chemical input and whether signaling proceeds along the peripheral nerve. This makes channel-dependent activation an important mechanistic focus when studying how analgesic treatments may suppress pain signaling at its origin.
Inflammatory sensitization can increase the responsiveness of pain sensory neurons, changing how strongly they react to relevant inputs. This is pharmacologically important because a treatment may act by reducing that sensitization rather than simply blocking every electrical impulse. Examining this mechanism helps distinguish drug effects on heightened peripheral responsiveness from effects on signal transmission or central pain processing.
Peripheral actions occur near the sensory neuron or along the nerves carrying impulses toward the spinal cord, whereas central actions alter signaling or interpretation within the spinal cord and brain. This distinction provides a framework for comparing analgesic mechanisms: one treatment may limit initiation or transmission, while another may influence how incoming signals are processed centrally.
Researchers can examine an analgesic by asking which stage of the pathway it changes: stimulus-related neuronal activation, peripheral impulse transmission, inflammatory sensitization, or central processing. This pathway-based approach connects an observed reduction in pain signaling with a possible mechanism of action. It also helps organize studies of treatments intended for acute pain, chronic pain, or both.
These studies can show whether a treatment reduces pain by acting on peripheral sensitization, impulse transmission, or central processing. They also provide context for interpreting unwanted drug effects, because altering pain pathways may influence more than the intended signal. Comparing pathway-level effects with outcomes in acute and chronic pain supports more informed evaluation of analgesic treatments.