THE POSTURAL REACTION TO THE DROP OF A HINDLIMB SUPPORT IN THE STANDING CAT REMAINS FOLLOWING SENSORIMOTOR CORTICAL ABLATION
THE POSTURAL REACTION TO THE DROP OF A HINDLIMB SUPPORT IN THE STANDING CAT REMAINS FOLLOWING SENSORIMOTOR CORTICAL ABLATION
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DOI：
10.1016/0304-3940(85)90452-5
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发表时间：
1985-01-01
影响因子：
2.5
通讯作者：
SYBIRSKA, E
中科院分区：
文献类型：
--
作者：
DUFOSSE, M;MACPHERSON, J;SYBIRSKA, E
在自由站立的猫中，对任何后肢平台意外下降的姿势反应进行了研究。分析了垂直力、前肢肌电图活动和躯干运动。观察到一个刻板的对角线支持模式。先对1条后肢进行卸载，然后对对角方向的前肢进行卸载，再对其他2条肢体进行加载。在同侧负重的前肢中，力量增加之前是二头肌的激活，并伴随着三头肌的共同激活。在对侧无负荷前肢，观察到肱二头肌（激活）和肱三头肌（抑制）的相互变化，并在力降低之前。电影记录显示，脊柱在胸高水平处的侧向或垂直位移或旋转不早于后肢下降后100 ms开始，因此跟随肌电图变化。单侧感觉运动皮质消融对这种模式或前肢肌图反应的潜伏期没有影响。后肢下垂触发了集中组织的刻板前肢肌电反应；这些反应不是通过感觉-运动皮层回路介导的。
The postural response to an unexpected drop of either hindlimb platform was studied in the freely standing cat. The vertical forces, the forelimb electromyographic (EMG) activities and the movement of the trunk were analyzed. A stereotyped diagonal pattern of support was observed. The imposed unloading of 1 hindlimb was followed by unloading of the diagonally opposite forelimb and loading of the 2 other limbs. In the ipsilateral loaded forelimb, the force increase is preceded by an activation of the biceps and is concomitant with a triceps coactivation. In the contralateral unloaded forelimb, reciprocal changes of biceps (activation) and triceps (inhibition) were observed and preceded the force decrease. Lateral or vertical displacement or rotation of the vertebral column at the high thoracic level, as evidenced by movie recording, began no earlier than 100 ms after the hindlimb drop and thus followed the EMG changes. Unilateral sensorimotor cortex ablation had no effect on this pattern or on the latencies of forelimb myographic responses. The hindlimb drop triggers stereotyped forelimb EMG responses which are organized centrally; these responses are not mediated via a sensorimotor cortical loop.