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The cortical representation of sensory inputs arising from bone
Jason J Ivanusic1, Vineet Sahai, David A Mahns
1Department of Anatomy and Cell Biology, University of Melbourne, Melbourne, VIC 3010, Australia. j.ivanusic@unimelb.edu.au
Brain Research
|March 17, 2009
Summary
Sensory information from bone travels to the brain
Area of Science:
- Neuroscience
- Somatosensory System
- Pain Perception
Background:
- Bone sensory innervation is not fully understood.
- The pathways for discriminative touch and pain from bone are unclear.
Purpose of the Study:
- To investigate how sensory information from bone reaches the somatosensory cortex.
- To identify the neural pathways involved in bone-related sensory processing.
Main Methods:
- Electrical stimulation of the nerve innervating the cat humerus.
- Recording evoked potentials on the surface of the primary (SI) and secondary (SII) somatosensory cortex.
- Analysis of response latency and amplitude.
Main Results:
- Short-latency evoked potentials (6-11 ms) were recorded in SI and SII cortices.
- These responses are consistent with activation of A delta nerve fibers.
- Response amplitude correlated with stimulus intensity, suggesting intensity coding.
- Long-latency responses, indicative of C fiber activation, were not observed.
Conclusions:
- Sensory information from bone reaches discriminative areas of the somatosensory cortex via A delta fibers.
- This pathway likely contributes to the discriminative aspects of bone pain.
- Inhibition may play a role in modulating C fiber input to the cortex.
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