Light microscopic observations of the contacts made between two spindle afferent types and α‐motoneurons in the cat trigeminal motor nucleus
Light microscopic observations of the contacts made between two spindle afferent types and α‐motoneurons in the cat trigeminal motor nucleus
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猫三叉神经运动核中两个纺锤体传入类型和 α 运动神经元之间接触的光显微镜观察
DOI：
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Y. Shigenaga
中科院分区：
文献类型：
--
作者：
N. H. Yabuta;K. Yasuda;Y. Nagase;A. Yoshida;Yumiko Fukunishi;Y. Shigenaga
以往的研究表明，猫颌肌梭传入可以分为两种类型（I型和II型）的轴突轨迹的基础上。本研究采用辣根过氧化物酶（HRP）细胞内注射技术，观察了猫梭形传入纤维与咬肌α运动神经元之间的关系，并对两者之间的突触结构提供了新的发现。5个I型传入纤维-运动神经元对和9个II型传入-运动神经元对用HRP良好染色。结果表明：（1）运动神经元只接受来自任一特定纺锤体传入纤维的一侧支的接触。2)传入和运动神经元之间的接触的数量从一到三不等。3)纺锤体传入纤维的接触点位于同一树突或同一初级树突的分支上。4)绝大多数传入神经与运动神经元的接触分布在距离索马600 μm以内的树突树中，即，在树突树的近四分之三处。在两种传入类型之间观察到的差异如下。第一，II型传入终端上的运动神经元比I型传入终端的远端树突的接触。第二，I型传入和运动神经元之间的接触聚集在一起，但II型传入和运动神经元之间的广泛分散。
Previous studies indicate that cat jaw‐muscle spindle afferents can be divided into two types (type I and II) on the basis of their axonal trajectories. The present study examined the relationship between spindle afferent fibers and their target masseter α‐motoneurons in the cat by using the intracellular horseradish peroxidase (HRP) injection technique, and provided several new findings on the synaptic organization generated between the two. Five type I afferent fiber‐motoneuron pairs and nine type II afferent‐motoneuron pairs were well stained with HRP. The following conclusions were drawn: 1) A motoneuron received contacts from only one collateral of any given spindle afferent. 2) The number of contacts made between an afferent and a motoneuron ranged from one to three. 3) The contacts made by a spindle afferent were on the same dendrite or dendrites branching from the same primary dendrite. 4) The vast majority of the contacts made by an afferent on a motoneuron were distributed in the dendritic tree within 600 μm from the soma, i.e., in the proximal three fourths of the dendritic tree. The differences observed between the two afferent types were as follows. First, type II afferent terminals made contacts on more distal dendrites of the motoneurons than did type I afferent terminals. Second, the contacts made between a type I afferent and a motoneuron were clustered together, but those made between a type II afferent and a motoneuron were widely dispersed.
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