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在直接观察刺激动态和静态运动轴突的效果后,对猫肌梭进行组织学分析。

Histological analysis of cat muscle spindles following direct observation of the effects of stimulating dynamic and static motor axons.

作者信息

Banks R W, Barker D, Bessou P, Pagès B, Stacey M J

出版信息

J Physiol. 1978 Oct;283:605-19. doi: 10.1113/jphysiol.1978.sp012522.

Abstract
  1. Eleven cat tenuissimus spindles have been analysed mainly by cutting serial, transverse, 1 micrometer thick sections following direct observation of the effects of dynamic motor (gamma or beta) stimulation. 2. Histological results from these spindles were also used to interpret the effects of static fusimotor stimulation of other spindles. 3. Dynamic motor stimulation usually produced contractions seen as convergent movements of sarcomeres in single bag fibres, identified as bag1 fibres for reasons given in the text. 4. In one spindle a single dynamic axon produced a translational movement in one pole of a bag1 fibre and a convergent movement in each pole of a bag2 fibre, together with movements in other unidentified (presumably chain) fibres. Subsequent analysis showed that besides innervating both bag fibres the axon also supplied two chain fibres. 5. Contrary to expectation, motor endings on the bag1 fibres seldom occurred at the sites of convergent movement. Only two cases of coincidence occurred among sixteen foci and twenty-one motor endings; otherwise focus and nearest ending were separated by distances of 0.85--2.5 mm. 6. Most of the convergent movements of sarcomeres observed in bag1 fibres occurred in a region of the pole that is ultrastructurally distinct from the region where most of the motor endings were located. The possible relevance of this to the production of contractions in the bag1 fibre is discussed. 7. Convergent movement foci in bag2 fibres produced by the stimulation of static axons occurred largely within the same regions of the pole as the motor endings were located, though, whereas foci were observed in both intra- and extracapsular regions, most of the endings were intracapsular.
摘要
  1. 对11个猫的 tenuissimus 肌梭进行了分析,主要方法是在直接观察动态运动(γ或β)刺激的效果后,切割连续的、横向的、1微米厚的切片。2. 这些肌梭的组织学结果也被用于解释其他肌梭静态肌梭运动刺激的效果。3. 动态运动刺激通常会引起收缩,表现为单袋纤维中肌节的汇聚运动,根据文中给出的原因,该单袋纤维被确定为袋1纤维。4. 在一个肌梭中,一条单一的动态轴突在袋1纤维的一极产生平移运动,在袋2纤维的每一极产生汇聚运动,同时在其他未识别的(可能是链状)纤维中也产生运动。随后的分析表明,除了支配两条袋纤维外,该轴突还支配两条链状纤维。5. 与预期相反,袋1纤维上的运动终末很少出现在汇聚运动的部位。在16个焦点和21个运动终末中,只有两例重合;否则,焦点与最近的终末之间的距离为0.85 - 2.5毫米。6. 在袋1纤维中观察到的大多数肌节汇聚运动发生在极区的一个区域,该区域在超微结构上与大多数运动终末所在的区域不同。文中讨论了这与袋1纤维收缩产生的可能相关性。7. 由静态轴突刺激产生的袋2纤维中的汇聚运动焦点主要出现在与运动终末相同的极区区域内,不过,虽然在囊内和囊外区域都观察到了焦点,但大多数终末位于囊内。

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本文引用的文献

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8

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