Related Experiment Video
Updated: Jul 16, 2026
06:08
Assessing Rat Diaphragm Motor Unit Connectivity Outcome Measures as Quantitative Biomarkers of Phrenic Motor Neuron Degeneration and Compensation
Published on: April 19, 2024
Insights into Cervical Phrenic Nerve Variations Based on Cadaveric Dissection and Intraoperative Electromyography.
Xingyi Ma1, Zirui Yu1, Chenglong Zhao2
1Huashan Hospital Fudan University, Department of Hand Surgery, China, Shanghai.
Journal of Reconstructive Microsurgery
|July 14, 2026
Summary
Phrenic nerve variations (PNVs) are common in cervical surgeries, potentially causing diaphragmatic dysfunction even when the main nerve is intact. Intraoperative EMG monitoring helps identify and preserve these crucial PNVs, reducing surgical risks.
Area of Science:
- Neurosurgery
- Anatomy
- Electrophysiology
Background:
- Cervical nerve surgeries require phrenic nerve (PN) integrity.
- Postoperative diaphragmatic dysfunction can occur despite preserving the main PN trunk.
- Phrenic nerve variations (PNVs) may explain this paradox.
Purpose of the Study:
- Characterize the prevalence and electrophysiology of cervical PNVs.
- Utilize contralateral C7 nerve transfer as a surgical model.
- Combine cadaveric dissection with intraoperative EMG monitoring.
Main Methods:
- Performed cadaveric dissections.
- Conducted intraoperative EMG monitoring during CC7.
- Analyzed PNV and PN electrophysiological responses.
Main Results:
- PNV prevalence: 31.8% (dissection) vs. 63.3% (EMG).
- PNVs often coursed lateral to the main PN.
- Moderate correlation between PNV and PN responses; PNVs may contribute to diaphragmatic innervation.
Conclusions:
- Intraoperative EMG reveals higher PNV prevalence than anatomical studies.
- Preserving identified PNVs reduces iatrogenic injury risk.
- EMG is valuable for identifying functionally significant PNVs in cervical procedures.
