Recording Forelimb Muscle Activity in Head&#45;Fixed Mice with Chronically Implanted EMG Electrodes

Amy Claire Kristl; Turgay Akay; Andrew Miri

doi:10.3791/66584

Registrando a atividade muscular dos membros anteriores em camundongos com cabeça fixa com eletro...

JoVE Journal
Neuroscience

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JoVE Journal Neuroscience

Recording Forelimb Muscle Activity in Head-Fixed Mice with Chronically Implanted EMG Electrodes

Registrando a atividade muscular dos membros anteriores em camundongos com cabeça fixa com eletrodos EMG implantados cronicamente

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05:43 min

March 29, 2024

DOI: 10.3791/66584-v

Amy Claire Kristl¹, Turgay Akay², Andrew Miri¹

¹Department of Neurobiology,Northwestern University, ²Department of Medical Neuroscience,Dalhousie University

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Overview

This study details a protocol for the hand fabrication and surgical implantation of electromyographic (EMG) electrodes in the forelimb muscles of mice. The aim is to record muscle activity during head-fixed behavior experiments to understand the differential control of movement by the primary and secondary motor cortices.

Key Study Components

Area of Science

Neuroscience
Electrophysiology
Behavioral Analysis

Background

Interactions between primary and secondary motor cortex influence muscle activity.
Both motor areas project to the spinal cord, but their differential influence on movement is unclear.
The use of forelimb muscle EMG provides insight into muscle activity during different movements.
Large-scale multi-electrode arrays enable the simultaneous recording from many neurons.

Purpose of Study

To compare the effects of inactivating primary and secondary motor cortex on forelimb muscle activity.
To determine how these regions differentially control movement across various muscle activity states.
To utilize EMG measurements alongside neural recordings to better understand motor control.

Methods Used

The protocol involves both the fabrication of EMG electrodes and their surgical implantation in mice.
Mice are used as the biological model to examine muscle activity and motor cortex interactions.
Details include precise surgeries and knot-tying techniques for secure electrode placement.
The timeline includes careful step-by-step instructions for electrode preparation and implantation.
All implanted electrodes were functional, producing clean EMG signals shortly after implantation.

Main Results

The study successfully demonstrates the functionality of implanted electrodes in recording muscle activity.
Findings indicate that direct motor cortical influence on muscles varies with motor behavior and muscle states.
Electrode performance was validated over time, with some electrodes failing after prolonged periods.
The approach enables detailed examination of the interactions between motor cortical areas and muscle responses.

Conclusions

This protocol provides a reliable method for recording muscle activity essential for dissecting motor control mechanisms.
While multiomics analysis was not applicable here, the work contributes to understanding neuronal interactions in motor control.
The findings have implications for further studies on the plasticity of motor systems and their roles in movement disorders.

Frequently Asked Questions

What are the advantages of using EMG electrodes in this study?

EMG electrodes allow for direct measurements of muscle activity, providing insights into the functional role of different motor cortical areas in movement.

How is the electrode implantation performed?

The procedure involves careful preparation of electrodes followed by surgical implantation into the forelimb muscles of anesthetized mice.

What types of data can be obtained through EMG recordings?

EMG recordings capture muscle activation patterns, which can be correlated with neural activity from the motor cortex, revealing insights into motor control.

Can this method be adapted for other muscle groups?

Yes, while this study focuses on forelimb muscles, the protocol can be adapted for other muscle groups depending on the research question.

What are potential limitations of this electrode implantation technique?

Challenges may include maintaining electrode stability long-term and the possibility of signal degradation or loss over time.

How do the findings inform future studies in motor control?

The insights gained can guide future research on the mechanisms of motor control and the relationship between neural circuits and muscle behavior.

What types of movements were investigated in this study?

The study explores various motor behaviors elicited during head-fixed tasks to assess how different motor cortices influence muscle activity.

Este protocolo descreve a fabricação manual e a implantação cirúrgica de eletrodos eletromiográficos (EMG) nos músculos dos membros anteriores de camundongos para registrar a atividade muscular durante experimentos de comportamento com a cabeça fixa.

Estou interessado em como partes do córtex motor do camundongo, chamadas córtex motor primário e secundário, interagem umas com as outras para influenciar a atividade muscular durante diferentes tipos de movimentos. Portanto, sabemos que o córtex motor primário e secundário se projeta para a medula espinhal, mas não está claro como eles influenciam diferencialmente o movimento. Então, estou usando este protocolo para comparar os efeitos da inativação do córtex motor primário e secundário na atividade muscular dos membros anteriores durante o movimento para entender como eles controlam diferencialmente o movimento.

O uso da EMG do músculo do membro anterior nos permitiu medir o impacto da inativação optogenética de diferentes regiões do sistema motor na produção motora. Por exemplo, fomos capazes de mostrar que a influência cortical motora direta nos músculos é específica para certos comportamentos motores e estados particulares de atividade muscular durante esses comportamentos. Novas matrizes de vários eletrodos em grande escala, como o Neuropixels, agora nos permitem gravar grandes populações neuronais em várias regiões do sistema motor simultaneamente.

A realização de registros EMG durante esses registros neurais nos permitirá caracterizar como as interações entre essas regiões do sistema motor dependem do estado de atividade muscular.

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