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Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
Published on: December 5, 2012
Motor neuron involvement in experimental lumbar nerve root compression: a light and electron microscopic study.
Shigeru Kobayashi1, Kenzo Uchida, Takafumi Yayama
1Department of Orthopedic Surgery and Rehabilitation Medicine, Fukui University School of Medicine, Fukui, Japan. kshigeru@fmsrsa.fukui-med.ac.jp
Spine
|April 7, 2007
Summary
Mechanical nerve root compression causes lumbar motor neuron changes, including chromatolysis and apoptosis. These findings indicate that spinal cord motor neuron dysfunction extends beyond the compression site, impacting recovery from lower leg weakness.
Area of Science:
- Neuroscience
- Spinal Cord Research
- Motor Neuron Biology
Background:
- Lumbar motor neuron changes are crucial for understanding weakness mechanisms.
- Previous research has limitedly explored neuronal alterations from nerve root compression and disturbed axonal flow.
Purpose of the Study:
- To investigate lumbar motor neuron changes induced by mechanical nerve root compression in an in vivo model.
- To determine the effects of axonal flow disturbance on lumbar motor neurons.
Main Methods:
- Mechanical compression of the seventh lumbar nerve root in mongrel dogs for 1 or 3 weeks.
- Morphological examination of motor neurons using light and electron microscopy.
Main Results:
- Central chromatolysis observed in lumbar motor neurons after 1 week of compression.
- Apoptosis detected in ventral horn neurons after 3 weeks of compression.
Conclusions:
- Nerve root compression leads to motor neuron dysfunction within the lumbar cord due to axon reaction.
- Patient weakness may persist post-surgery due to these extended neuronal changes.
