Related Experiment Video
Updated: Jul 6, 2026
09:07
Electrophysiological Motor Unit Number Estimation (MUNE) Measuring Compound Muscle Action Potential (CMAP) in Mouse Hindlimb Muscles
Published on: September 25, 2015
Hindlimb movement in the cat induced by amplitude-modulated stimulation using extra-spinal electrodes
Changfeng Tai1, Jicheng Wang, Bing Shen
1Department of Pharmacology, University of Pittsburgh, W1354 Biomedical Science Tower, Pittsburgh, PA 15261, USA. cftai@pitt.edu
Journal of Neural Engineering
|March 29, 2008
Summary
Electrical stimulation of the cat spinal cord can induce hindlimb movement, even after transection. This method shows promise for restoring locomotion after spinal cord injury.
Area of Science:
- Neuroscience
- Locomotion research
- Spinal cord stimulation
Background:
- Restoring hindlimb movement after spinal cord injury is a significant challenge.
- Understanding the neural control of locomotion is crucial for developing effective therapies.
Purpose of the Study:
- To investigate hindlimb movement induction via electrical stimulation of the feline spinal cord and nerve roots.
- To determine the effects of spinal cord transection on stimulation-induced movements.
- To explore the potential of this method for restoring locomotor function.
Main Methods:
- Electrical stimulation (amplitude-modulated waveform) of the L5-S1 spinal cord dorsal surface and L5-S1 dorsal/ventral roots in cats.
- Acute spinal cord transection at the T13-L1 level.
- Analysis of induced hindlimb movements (flexion, extension) and ground reaction forces.
- Varied stimulation sites (rostral/caudal segments, midline/across spinal cord) and root stimulation (dorsal/ventral, ipsilateral/bilateral).
Main Results:
- Stimulation induced coordinated multi-joint hindlimb flexion or extension, dependent on stimulation site (rostral to caudal).
- Dorsal root stimulation, particularly L7, produced the strongest ground reaction force, capable of supporting body weight.
- Bilateral movements were induced by midline/across-cord stimulation, while single root stimulation yielded ipsilateral movement.
- Spinal cord transection did not alter the stimulation-induced responses, suggesting supraspinal centers are not required.
- Stepping patterns at various speeds were achievable through combined stimulation of different spinal segments.
Conclusions:
- Electrical stimulation of the spinal cord and nerve roots can effectively evoke hindlimb movements in cats.
- The induced movements are independent of supraspinal input, highlighting the spinal cord's intrinsic locomotor capabilities.
- This stimulation strategy offers a potential method for restoring locomotor function following spinal cord injury.
