Extracellular single-unit recordings from peripheral nerve axons in vitro by a novel multichannel microelectrode...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• The peripheral nervous system (PNS) is a key target for modulating central nervous system input.
• Understanding PNS neural encoding requires single-unit recordings from individual peripheral neurons or axons.
• Existing electrodes face challenges due to connective tissue layers surrounding peripheral nerve fibers.

Purpose of the Study:

• To develop a novel microelectrode array (MEA) for improved single-unit recordings from peripheral nerve fibers.
• To overcome technical challenges in isolating and recording from individual peripheral axons.
• To facilitate mechanistic understanding of peripheral neural encoding and modulation.

Main Methods:

• Silicon-based microfabrication of a novel MEA with parallel hydrophilic gold electrodes and hydrophobic surfaces.
• Utilizing hydrophilic/hydrophobic surface patterning to guide peripheral nerve filaments for self-alignment.
• Validation through simultaneous single-unit action potential recordings from individual axons in mouse sciatic nerves (A-fibers and C-fibers).

Main Results:

• Successful development of a novel MEA facilitating self-alignment of nerve filaments.
• Demonstrated simultaneous single-unit recordings from both myelinated A-fibers and unmyelinated C-fibers.
• Confirmed single-unit isolation by verifying stable spike shape and amplitude across varying stimulus intensities.

Conclusions:

• The novel MEA significantly reduces technical challenges for peripheral single-unit recordings.
• This technology has the potential to broaden adoption within the research community.
• Expedited mechanistic understanding of peripheral neural encoding and modulation is anticipated.