OBJECTIVE To establish a method for magnetospinography (MSG) measurement after ulnar nerve stimulation and to clarify its characteristics. METHODS Using a 132-channel magnetoneurography system with a superconducting quantum interference device, cervical MSG measurements were obtained for 10 healthy volunteers after stimulation of the ulnar nerve at the elbow and the wrist, and neural current distribution was calculated and superimposed on the cervical X-ray images. RESULTS Neuromagnetic signals were obtained in all participants after applying the stimulus artifact removal algorithm. The measured magnetic field intensity after elbow stimulation was about twice that after wrist stimulation. Calculated neural currents flowed into the intervertebral foramina at C6/7 to T1/2 and propagated cranially along the spinal canal. The conduction velocity from the peak latency of inward currents at C5-C7 was 73.4 ± 19.6 m/s. CONCLUSIONS We successfully obtained MSG measurements after ulnar nerve stimulation. The neural currents flowed into the spinal canal from more caudal segments after ulnar nerve stimulation compared with median nerve stimulation, and these MSG measurements were effective in examining the spinal tracts at C5/6/7. SIGNIFICANCE This is the first report on the use of MSG to visualize electrical activity in the cervical spinal cord and nerve root after ulnar nerve stimulation.

中文翻译：

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使用脑脊液造影术观察尺神经刺激后颈脊髓和神经根的电活动

目的建立尺神经刺激后脊髓磁力图（MSG）测量方法并阐明其特点。方法采用132通道超导量子干涉装置，对10名健康志愿者进行肘部和腕部尺神经刺激后获得颈椎MSG测量值，计算神经电流分布并叠加在颈椎X-射线图像。结果 在应用刺激伪影去除算法后，所有参与者都获得了神经磁信号。肘部刺激后测得的磁场强度约为手腕刺激后的两倍。计算出的神经电流在 C6/7 至 T1/2 处流入椎间孔，并沿椎管向颅侧传播。C5-C7 内向电流峰值潜伏期的传导速度为 73.4 ± 19.6 m/s。结论 我们在尺神经刺激后成功获得了 MSG 测量值。与正中神经刺激相比，尺神经刺激后神经电流从更多的尾段流入椎管，这些 MSG 测量可有效检查 C5/6/7 的脊髓束。意义这是关于在尺神经刺激后使用味精来可视化颈脊髓和神经根中的电活动的第一份报告。与正中神经刺激相比，尺神经刺激后神经电流从更多的尾段流入椎管，这些 MSG 测量可有效检查 C5/6/7 处的脊髓束。意义这是关于在尺神经刺激后使用味精来可视化颈脊髓和神经根中的电活动的第一份报告。与正中神经刺激相比，尺神经刺激后神经电流从更多的尾段流入椎管，这些 MSG 测量可有效检查 C5/6/7 的脊髓束。意义这是关于在尺神经刺激后使用味精来可视化颈脊髓和神经根中的电活动的第一份报告。