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Updated: Jan 6, 2026
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An In Vitro Adult Mouse Muscle-nerve Preparation for Studying the Firing Properties of Muscle Afferents
Published on: September 24, 2014
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Muscle spindles provide flexible sensory feedback for movement sequences
William P Olson1, Varun B Chokshi1, Jeong Jun Kim1
1The Solomon H. Snyder Department of Neuroscience, Kavli Neuroscience Discovery Institute, Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, MD 21218, USA.
Cell Reports
|October 23, 2025
Summary
Jaw muscle spindle afferents (MSAs) provide crucial sensory feedback for movement. Their responses dynamically adjust during complex tasks, indicating flexible sensorimotor control crucial for motor performance.
Area of Science:
- Neuroscience
- Motor Control
- Sensory Physiology
Background:
- Sensory feedback is vital for adaptable motor performance.
- Muscle spindle afferents (MSAs) are primary sources of movement feedback.
- Jaw MSAs, uniquely located centrally, are modulated by fusimotor and synaptic inputs, enabling flexible sensorimotor control.
Purpose of the Study:
- To investigate the role of jaw MSAs in encoding kinematics during a directed lick sequence task in mice.
- To determine how jaw MSA activity adapts to different stages of a complex motor task.
Main Methods:
- Electrophysiological recordings from jaw MSAs in mice.
- Behavioral analysis of a directed lick sequence task.
- Analysis of kinematic encoding and spiking variability in jaw MSAs.
Main Results:
- Jaw MSAs encode complex jaw-tongue kinematics during the lick task.
- Kinematic encoding explains less than half of jaw MSA spiking variability.
- Jaw MSA coding of kinematics shifts with task progression (sequence start, middle, end, reward).
Conclusions:
- Jaw MSAs exhibit flexible tuning across task progression, suggesting dynamic modulation of sensory feedback.
- Dynamic feedback from jaw MSAs likely shapes sensorimotor control during complex behaviors.
- Jaw MSAs are a key site for adaptive motor control.
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