Spatial organization of neck and vestibular reflexes acting on the forelimbs of the decerebrate cat.
Spatial organization of neck and vestibular reflexes acting on the forelimbs of the decerebrate cat.
复制标题
作用于去大脑猫前肢的颈部和前庭反射的空间组织。
DOI：
10.1152/jn.1986.55.3.514
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发表时间：
1986
影响因子：
2.5
通讯作者：
Park,BR
中科院分区：
文献类型：
--
作者：
Wilson,VJ;Schor,RH;Suzuki,I;Park,BR
肌电图记录用于研究作用于去大脑猫前肢和肩部肌肉的前庭和强直性颈反射的空间组织。在完整迷路以及急性或慢性迷路切除术的标本中研究了颈部反射。反射是通过响应向量来描述的，其方向分量与倾斜或头部旋转的最佳兴奋方向一致。肌肉的矢量方向在几个小时内保持相当稳定，尽管在实验开始或结束时有时会出现漂移。刺激频率为 0.05-2.0 Hz 时，肌肉反应矢量的方向不会发生系统性变化。对于前庭反射来说也是如此，尽管它们的动态与半规管和耳石器官的汇聚输入一致。无论准备如何，都会出现一致的反射模式。前庭反射的特征是接近耳朵向下滚动的反应向量方向。颈部矢量方向位于与前庭矢量相反的方向，但通常距离滚动平面更远：鼻子向上的俯仰对肩部肌肉冈上肌和冈下肌以及三头肌的内侧和外侧头有兴奋作用，而鼻子向下的俯仰则兴奋三头肌的长头。我们的结果总体上与 Roberts (28) 提出的颈部反射模式一致，但部分不同意他提出的前庭反射模式；我们没有看到预期的机头朝下俯仰所带来的持续兴奋。
EMG recording was used to study the spatial organization of vestibular and tonic neck reflexes acting on forelimb and shoulder muscles of the decerebrate cat. Neck reflexes were studied in preparations with intact labyrinths as well as those with acute or chronic labyrinthectomies. Reflexes were described by response vectors whose orientation component is aligned with the optimal excitatory direction of tilt or head rotation. A muscle's vector orientation remained reasonably stable over a period of hours, although there was sometimes drift at the beginning or end of an experiment. Orientation of muscle response vectors did not change systematically with stimulus frequency of 0.05-2.0 Hz. For vestibular reflexes this is so, although their dynamics are consistent with convergent input from semicircular canals and otolith organs. Regardless of the preparation, a consistent reflex pattern emerged. Vestibular reflexes are characterized by response vector orientation near ear-down roll. Neck vector orientation lies in the opposite direction from the vestibular vector but typically lies further from the roll plane: Nose-up pitch is excitatory for the shoulder muscles supra- and infraspinatus, and for the medial and lateral heads of triceps, whereas nose-down pitch excites the long head of triceps. Our results generally agree with the pattern proposed by Roberts (28) for neck reflexes but disagree in part with his proposed pattern of vestibular reflexes; we did not see the expected consistent excitation by nose-down pitch.