Contralateral Diaphragm Activity
Contralateral Diaphragm Activity - Related Videos
09:43
Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
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Cited by 16 •
2015
Compound muscle action potential recording quantitatively assesses functional diaphragm innervation by phrenic motor neurons. Whole-mount diaphragm immunohistochemistry assesses morphological innervation at individual neuromuscular junctions. The goal of this protocol is to demonstrate how these two powerful methodologies can be used in various rodent models of spinal cord disease.
06:40
Measuring the Contralateral Silent Period Induced by Transcranial Magnetic Stimulation
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2025
This video demonstrates a technique for measuring the contralateral silent period (cSP) using transcranial magnetic stimulation. Position the patient's hand prone and place an electrode on the first dorsal interosseous (FDI) muscle. Then, place a force-measuring device between the thumb and index finger. Identify the primary motor cortex (M1) region of the brain. Maintain a standardized pressure on the force-measuring device and stimulate the M1 region to record the muscle activity, termed the...
07:12
Diagnostic Ultrasound Imaging of Mouse Diaphragm Function
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Cited by 7 •
2014
Diagnostic ultrasound imaging has proven to be effective in diagnosing various respiratory diseases in human and animal subjects. We demonstrate a comprehensive ultrasound protocol utilized by Dr. Zuo's lab to analyze diaphragm kinetics specifically in mouse models. This is also a non-invasive research technique which can provide quantitative information on mouse respiratory muscle function.
02:48
Fluorescence Imaging of Calcium Dynamics at Neuromuscular Junctions in the Diaphragm of a Transgenic Mouse
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2025
Source: Heredia, D. J., et. al. Ex Vivo Imaging of Cell-specific Calcium Signaling at the Tripartite Synapse of the Mouse Diaphragm. J. Vis. Exp. (2018) This video demonstrates fluorescence imaging of calcium dynamics at neuromuscular junctions (NMJs) in a transgenic mouse expressing genetically encoded calcium indicators. A NJM is identified by fluorescently tagged acetylcholine receptors in the diaphragm with the phrenic nerve. An image splitter is used to visualize multiple signals...
05:09
Assessing Functional Recovery of Eupneic Diaphragm Activity Following Unilateral Cervical Spinal Cord Hemisection in Rats
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Cited by 5 •
2024
Respiratory complications are the leading cause of death in individuals with cervical spinal cord injury (cSCI). Animal models of cSCI are essential for mechanistic evaluations and pre-clinical studies. Here, we introduce a reproducible method to assess functional recovery of diaphragm muscle (DIAm) activity following unilateral C2 spinal hemisection (C2SH) in rats.
FAQs
Respiratory drive generated in brainstem networks descends through spinal pathways to phrenic motor neurons, which control diaphragm activation. Crossed neural connections can transmit this drive to the side opposite a unilateral stimulus, lesion, or recording site. Examining that contralateral response helps researchers assess how bilateral respiratory circuits coordinate breathing rather than treating each side as an isolated pathway.
A response in the opposite hemidiaphragm indicates that activity associated with one side can influence respiratory output on the other side. This pattern provides evidence about the organization of crossed connections between respiratory networks and spinal pathways. Its presence or alteration can therefore help characterize bilateral motor coordination and the effects of unilateral neural disruption.
Unilateral injury can alter the balance of respiratory signaling between the two sides. Contralateral diaphragm activity may then provide evidence of neural reorganization or compensatory plasticity, meaning functional changes that help preserve coordinated output after disruption. Studying this response links respiratory motor activity with broader questions about how neural circuits adapt following damage.
Researchers can measure the response using diaphragm electromyography, nerve recordings, or neural stimulation. Electromyography records electrical activity from the muscle, while nerve recordings examine signals in respiratory pathways; stimulation tests how activity in one location influences the opposite side. Together, these approaches help relate a unilateral input or lesion to bilateral respiratory output.
Recording the opposite hemidiaphragm during a unilateral neural stimulus can show whether activity crosses between the two sides of the respiratory system. The resulting response helps investigators examine interhemispheric coordination and the functional connection between the stimulus site and contralateral respiratory output. This design is useful for distinguishing local effects from broader bilateral circuit participation.
Contralateral diaphragm activity offers a way to study respiratory circuit integrity and adaptation after spinal cord or brain injury. Because breathing depends on coordinated bilateral output, changes in the opposite-side response can inform research on motor control, compensatory plasticity, and recovery of respiratory function. The same framework also supports investigations of how neural damage disrupts or reorganizes respiratory pathways.