DEPENDENCE OF DYNAMIC-RESPONSE OF SPINDLE RECEPTORS ON MUSCLE LENGTH AND VELOCITY
DEPENDENCE OF DYNAMIC-RESPONSE OF SPINDLE RECEPTORS ON MUSCLE LENGTH AND VELOCITY
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DOI：
10.1152/jn.1981.46.1.143
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发表时间：
1981-01-01
影响因子：
2.5
通讯作者：
CRAGO, PE
中科院分区：
文献类型：
--
作者：
HOUK, JC;RYMER, WZ;CRAGO, PE
使用以0.4-100 mm/s范围内的速度施加于猫比目鱼肌的大（10 mm）斜坡拉伸来研究初级和次级肌梭受体的动态响应性。去大脑动物与基本上完整的脊神经根被用来保存自发的骨骼运动和梭运动活动和反射功能，只有少数细丝的背根被解剖，以获得同时记录从1-4个单一的传入。前根切断后，对不同的感受器进行了对照观察。长度依赖性从动态轨迹（在恒定速度下拉伸期间的平均放电速率与肌肉长度的曲线图）和速度依赖性从给定拉伸幅度下的放电增量与速度的曲线图进行评估。初级末梢的大的动态响应显然更适合于运动检测，而不是用于发出拉伸的精确速度的信号。减去第二结尾的反应，预计不会产生任何更大的依赖速度。
The dynamic responsiveness of primary and secondary muscle spindle receptors was studied using large (10 mm) ramp stretches applied to the cat soleus muscle at velocities in the range 0.4-100 mm/s. Decerebrate animals with substantially intact spinal roots were used to preserve spontaneous skeletomotor and fusimotor activity and reflex function; only a few fine filaments of dorsal root were dissected to obtain simultaneous recordings from 1-4 single afferents. Control observations on deefferented receptors were made after ventral root transection. Length dependence was assessed from dynamic trajectories (plots of average discharge rate vs. muscle length during stretch at constant velocity) and velocity dependence from plots of increment in discharge vs. velocity at a given stretch amplitude. The large dynamic responses of primary endings apparently are more suited for motion detection than for signaling the precise velocity of stretch. Subtraction of secondary-ending responses would not be expected to yield any greater dependence on velocity.