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Related Concept Videos

Functions of the Nervous System01:18

Functions of the Nervous System

The nervous system is responsible for coordinating and regulating the body's functions. It functions through three main processes: sensory, integrative, and motor processes. Sensory function involves the detection and transmission of information about internal and external stimuli from sensory receptors to the CNS. The CNS processes this information through an integrative function, where it interprets and makes decisions based on the incoming sensory information. Finally, the motor function...
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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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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Sensory Perception: Organization of the Somatosensory System01:11

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Physiological, Morphological and Neurochemical Characterization of Neurons Modulated by Movement
07:04

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Published on: April 21, 2011

Sensory-motor transformation by individual command neurons.

Pavel V Zelenin1, Grigori N Orlovsky, Tatiana G Deliagina

  • 1The Nobel Institute for Neurophysiology, Department of Neuroscience, Karolinska Institute, SE-171 77 Stockholm, Sweden. Pavel.Zelenin@ki.se

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 3, 2007
PubMed
Summary

Reticulospinal (RS) neurons in lampreys use vestibular input to control body orientation. These neurons transform sensory information into motor commands, creating corrective torques to stabilize posture during locomotion.

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Area of Science:

  • Neuroscience
  • Comparative Physiology
  • Motor Control

Background:

  • Maintaining body orientation during locomotion is crucial for animals.
  • Vestibular information is essential for sensing body position and movement in space.
  • Reticulospinal (RS) neurons play a key role in transmitting sensory information to motor pathways.

Purpose of the Study:

  • To characterize the sensory-motor transformation performed by individual RS neurons in lampreys.
  • To understand how vestibular input is converted into motor commands for body orientation control.
  • To investigate the role of RS neurons in generating corrective motor responses.

Main Methods:

  • Utilized a brainstem-spinal cord preparation with intact vestibular organs in lampreys.
  • Recorded vestibular responses of individual RS neurons to rotations in different planes.
  • Stimulated RS neurons and recorded responses in spinal motoneuron pools to estimate torque direction.

Main Results:

  • Identified two distinct groups of RS neurons for each orientation plane (roll, pitch, yaw).
  • Each group of RS neurons responded to rotation in one direction and generated counteracting torque.
  • Equal activity between opposing RS neuron groups stabilized body orientation, with deviations triggering corrective responses.

Conclusions:

  • Individual RS neurons perform sensory-motor transformation, converting orientation information into motor commands.
  • RS neurons generate corrective torques that stabilize body orientation during locomotion.
  • Parallel, closed-loop mechanisms involving RS neuron groups contribute to motor responses for orientation control.