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Updated: Feb 12, 2026
11:07
In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
Published on: May 11, 2020
5.8K
Monkey extensor digitorum communis motoneuron pool: Proximal dendritic trees and small motoneurons
Arthur B Jenny1, Paul D Cheney2, Andrew K Jenny1
1825 W. 53rd Street, Kansas City, MO 64112, United States.
Neuroscience Letters
|March 27, 2018
Summary
This study reveals that extensor digitorum communis motoneurons in monkey spinal cords have direction-oriented dendrites. These dendrites extend towards specific functional regions, indicating a structured dendritic organization.
Area of Science:
- Neuroscience
- Spinal Cord Anatomy
- Motor Neuron Research
Background:
- Previous studies provided transverse sections of monkey cervical spinal cord.
- Horse radish peroxidase (HRP) labeling was used to identify motoneurons.
Purpose of the Study:
- To create a 3D display of extensor digitorum communis (EDC) motoneurons and their dendrites.
- To analyze the spatial organization and orientation of motoneuron dendritic trees.
Main Methods:
- Reanalysis of existing monkey cervical spinal cord sections.
- Utilized Neurolucida software for 3D reconstruction.
- Examined HRP-labeled extensor digitorum communis (EDC) motoneurons and proximal dendrites.
Main Results:
- The EDC motoneuron pool is mainly in C8 and T1 spinal cord segments.
- Small gamma motoneurons (approx. 10%) are interspersed throughout the pool.
- Dendritic trees predominantly extend superiorly, dorsal-medially, or medially from the cell body.
Conclusions:
- Motoneuron dendritic trees exhibit directional organization.
- Dendrites appear to extend towards specific functional terminal regions.
- This suggests a functional specialization in dendritic arborization patterns.
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