ACTIVATION OF NECK MUSCLES FROM THE HUMAN MOTOR CORTEX
ACTIVATION OF NECK MUSCLES FROM THE HUMAN MOTOR CORTEX
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DOI：
10.1093/brain/111.4.801
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发表时间：
1988-08-01
期刊：
影响因子：
14.5
通讯作者：
APPLEGATE, C
中科院分区：
文献类型：
--
作者：
GANDEVIA, SC;APPLEGATE, C
经皮刺激运动皮质已被用来直接评估核上向胸锁乳突肌、斜方肌和头脾肌的投射。投射至胸锁乳突肌的对侧肌电反应潜伏期平均为6.5ms。同侧胸锁乳突肌的反应较小且变化较大，通常潜伏期较长(平均9.5ms)。双侧的肌电反应通过自主收缩或用力吸气而增强。它们在对侧胸锁乳突肌的刺激强度较低时被诱发。对侧斜方肌和头脾肌记录到短潜伏期反应，而同侧斜方肌和头脾肌未记录到。这些结果表明，核上性损伤后头部向偏瘫肢体旋转的减弱可能反映了背颈肌肉的力量减弱，而不是胸乳突肌的力量减弱。
Percutaneous stimulation of the motor cortex has been used to assess directly the supranuclear projection to the sternomastoid, trapezius and splenius capitis muscles. The projection to sternomastoid had a mean latency of 6.5 ms for the contralateral electromyographic response. A smaller and more variable response, usually with a longer latency (mean 9.5 ms), occurred in the ipsilateral sternomastoid. Electromyographic responses on both sides were potentiated by voluntary contraction or strong inspiratory efforts. They were evoked at lower stimulus intensities in the contralateral sternomastoid. Short-latency responses were recorded from the contralateral but not the ipsilateral trapezius and splenius capitis muscles. These results indicate that weakness of head rotation towards the hemiplegic limb following a supranuclear lesion may reflect reduced power of dorsal neck muscles rather than of sternomastoid.