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Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Related Experiment Video

Updated: Jun 2, 2026

Non-invasive Imaging and Analysis of Cerebral Ischemia in Living Rats Using Positron Emission Tomography with 18F-FDG

Non-invasive Imaging and Analysis of Cerebral Ischemia in Living Rats Using Positron Emission Tomography with ¹⁸F-FDG

Published on: December 28, 2014

Changes in somatosensory circuits after subcortical infarct in rats.

K Kataoka¹, T Hayakawa, T Mushiroi

¹Department of Neurosurgery, Kinki University, School of Medicine, Osaka-Sayama (Japan).

Restorative Neurology and Neuroscience

|May 10, 2011

Summary

Subcortical infarcts in rats impair somatosensory circuits acutely. However, functional recovery and increased activation in sensory areas are observed in the chronic stage, suggesting neural plasticity after stroke.

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Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation

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Published on: August 27, 2020

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Last Updated: Jun 2, 2026

Non-invasive Imaging and Analysis of Cerebral Ischemia in Living Rats Using Positron Emission Tomography with 18F-FDG

Non-invasive Imaging and Analysis of Cerebral Ischemia in Living Rats Using Positron Emission Tomography with ¹⁸F-FDG

Published on: December 28, 2014

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation

Published on: August 27, 2020

Area of Science:

Neuroscience
Stroke Research
Sensory Systems

Background:

Subcortical striatal infarcts can disrupt brain function.
Understanding the temporal dynamics of somatosensory circuit alterations post-stroke is crucial.

Purpose of the Study:

To compare functional and anatomical changes in somatosensory circuits during acute and chronic stages after subcortical striatal infarct in Wistar rats.

Main Methods:

Induction of subcortical striatal infarct via middle cerebral artery occlusion in rats.
Functional assessment using [14C]2-deoxyglucose autoradiography during vibrissae and facial stimulation.
Anatomical evaluation using wheat germ agglutinin-horseradish peroxidase axonal tracing.

Main Results:

Acute subcortical infarct reduced sensory-activated areas compared to controls.
Chronic subcortical infarct showed increased metabolic activation in sensory areas compared to the acute stage.
Tract tracing revealed reduced peroxidase-positive areas in the thalamus in both acute and chronic stages.

Conclusions:

Subcortical infarcts cause significant acute functional deficits in somatosensory processing.
Evidence of functional recovery and neural plasticity in somatosensory circuits emerges in the chronic stage post-stroke.