Spinal Cord Electrophysiology
January 18th, 2010
A demonstration of the isolation of neonatal mouse spinal cord for electrophysiologic studies.
Okay.Hello, my name is Alan Meyer and I'm a research assistant in the faf Laboratory at the Salk Institute. Today I'm going to show you how to perform a ventral laminectomy to isolate the spinal cord of a mouse as well, I will show you how to attach the spinal cord to an electrode. To record its neural activity, you'll need to prepare two solutions for the spinal cord, one for the dissection, and the other for the recording bath.
The only difference in the two solutions will be the concentration of calcium chloride. You will first need to prepare a solution of 10 X-A-C-S-F. This will require the reagents listed below.
Begin by adding 100 milliliters of the 10 X-A-C-S-F to a one liter volumetric flask. Next, fill the flask with water, but leave room so as not to overflow. When gassed gas, the solutions with a gas concentration of 5%CO2, and 95%O2.
To lower the pH and oxygenate solution, add one milliliter of one molar magnesium sulfate. Next, add one milliliter of a one molar calcium chloride solution to the dissection solution, and add two milliliters of one molar calcium chloride to the recording solution. Mice from ages E 16.5 to P four can be used in these experiments.
Begin dissecting the mouse by first swiftly, decapitating it with sharp scissors. Next, cut along the ventral midline until you reach the tail. Then using forceps, eviscerate the mouse, and rinse with the A CSF solution.
Use the one millimolar calcium chloride A CSF to perform the dissection. Place the mouse in the dissecting dish and pin the mouse out by placing a pin at its four paws and a pin at the base of the tail. Our goal for this portion Will be to isolate the spinal cord by cutting along the red dotted line, separating the spinal column from the lamina that encase the spinal cord.
This will allow you to expose the spinal cord. Next, follow along the line to cut out the meninges and spinal roots, freeing the spinal cord. Locate the spinal column and use one hand with tweezers to firmly grip the spinal column and the other with small scissors.
To remove the spinal cord, keep the scissors at a low angle. To avoid puncturing the cord with the tips of the scissors, we will now dissect the spinal cord. Following along the red line, cut the meninges and spinal roots.
To remove the spinal cord, you can cut along either side of the cord and then cut along the ventral midline. It is important to keep the scissors at a low angle so as not to puncture the spinal cord. It is important to avoid cutting the roots too close on the spinal cord.
Next, transfer the spinal cord to the recording bath and connect the electrodes to the spinal roots. Position the electrode near the root. Then using suction gently draw the nerve into the electrode.
Thank you for watching and I hope this video will be helpful in your future experiments.
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Overview
This article demonstrates the isolation of neonatal mouse spinal cord for electrophysiologic studies. The procedure includes performing a ventral laminectomy and attaching the spinal cord to an electrode for neural activity recording.
Key Study Components
Area of Science
- Neuroscience
- Electrophysiology
Background
- Isolation of spinal cord is crucial for studying neural activity.
- Electrophysiological techniques allow for the measurement of neural signals.
- Calcium chloride concentration is important for the dissection and recording solutions.
Purpose of Study
- To demonstrate the technique for isolating neonatal mouse spinal cord.
- To show how to attach the spinal cord to an electrode.
- To facilitate recording of neural activity.
Methods Used
- Ventral laminectomy procedure for spinal cord isolation.
- Preparation of dissection and recording solutions.
- Use of electrodes for neural activity recording.
Main Results
- Successful isolation of the spinal cord from neonatal mice.
- Effective attachment of the spinal cord to electrodes.
- Recording of neural activity demonstrated.
Conclusions
- The technique is viable for electrophysiological studies.
- Preparation of solutions is critical for successful outcomes.
- This method can be applied in various neuroscience research contexts.
Frequently Asked Questions
Executive Industry Relevance
This protocol enables isolation of neonatal mouse spinal cord for electrophysiologic assessment of central pattern generating circuitry, supporting mechanistic de-risking in target validation for neuromuscular disorders. The method provides a disease-relevant system to interrogate locomotor network function and evaluate compound effects on neural signaling. It enhances predictive confidence in early discovery by enabling quantitative measurement of electrophysiologic outputs from a validated preclinical model.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of therapeutic hypotheses related to locomotor circuit development and neuromuscular target engagement.
- Operational Value: Provides a reproducible preparation of spinal cord tissue for consistent electrophysiologic recording.
Screening & Assay Development
- Scientific Value: Supports assay standardization through controlled dissection solutions and defined calcium chloride concentrations for recording bath stability.
- Operational Value: Facilitates preparation of validated biological systems for downstream compound screening and signal detection workflows.
Translational & Preclinical Research
- Scientific Value: Offers a disease-relevant system to assess neural activity changes aligned with locomotor phenotypes in preclinical models.
- Operational Value: Enables continuity from discovery through preclinical validation by providing quantifiable electrophysiologic readouts.
Pipeline & Workflow Integration
The method integrates into early discovery workflows by providing isolated spinal cord preparations that support hypothesis testing and pathway clarification for neuromuscular targets.
- Discovery Biology: Supports hypothesis testing of central pattern generator function and neural circuit modulation.
- Screening: Enables assay readiness through standardized dissection and recording solutions with defined ionic composition.
- Analytics: Generates quantitative electrophysiologic measurements from ventral nerve roots to compare experimental conditions.
- Translational Research: Connects to preclinical continuity by providing a measurable output for locomotor-related target modulation.
- Enterprise Reuse: Establishes a reusable neural tissue preparation platform applicable across multiple neuromuscular discovery programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in target validation by reducing mechanistic ambiguity in locomotor circuit function.
- Operational Value: Ensures standardization and reproducibility through defined solution preparations and dissection techniques.
- Strategic Value: Improves go/no-go decisions by enabling early assessment of compound effects on neural signaling.
- Portfolio Impact: Supports risk-adjusted prioritization of neuromuscular targets based on electrophysiologic response profiles.
Implementation Considerations
- Requires expertise in neonatal mouse dissection and electrophysiologic recording techniques.
- Dependent on instrumentation for suction electrode attachment and neural signal acquisition.
- Necessitates cross-team standardization of dissection and recording solution preparation.
- Involves adaptation considerations when applying to different developmental stages or disease models.
- Limited by the need for precise calcium chloride concentration control to maintain tissue viability during recording.
