In vitro multichannel single-unit recordings of action potentials from mouse sciatic nerve

Area of Science:

• Neuroscience
• Biomedical Engineering
• Electrophysiology

Background:

• Neuromodulation devices utilize electrode arrays for peripheral nerve interfacing to manage organ symptoms.
• Achieving single-unit recording and stimulation of individual peripheral nerve axons presents significant technical hurdles.

Purpose of the Study:

• To establish an in vitro experimental setup for simultaneous single-unit recordings from multiple mouse sciatic nerve axons.
• To provide a robust platform for assessing novel neuromodulation strategies and evaluating electrode array designs for peripheral nerve applications.

Main Methods:

• Harvesting of mouse sciatic nerves and preparation for recording.
• Utilizing a custom-built multi-wire electrode array for interfacing with fine nerve filaments.
• Evoking and recording single-unit action potentials from individual axons using electrical stimulation.

Main Results:

• Successfully recorded from 186 individual axons, classifying them as A-type (CV > 1 m/s) and C-type (CV < 1 m/s).
• Demonstrated robust and repeatable single-unit recordings over 60 minutes with no bias towards axon type.
• Showcased the setup's utility by assessing ultrasonic modulation, observing increased nerve conduction velocity.

Conclusions:

• The developed in vitro setup enables reliable, simultaneous single-unit recordings from peripheral nerve axons.
• This platform is ideal for evaluating the efficacy of various neuromodulation techniques and next-generation electrode designs.
• The findings support advancements in targeted peripheral neuromodulation for therapeutic applications.