Physiologic and morphologic properties of motoneurons and spindle afferents innervating the temporal muscle in the cat
Physiologic and morphologic properties of motoneurons and spindle afferents innervating the temporal muscle in the cat
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猫支配颞肌的运动神经元和纺锤体传入神经的生理和形态特性
DOI：
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Y. Shigenaga
中科院分区：
文献类型：
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作者：
A. Yoshida;Norifumi Mukai;M. Moritani;Y. Nagase;Yohsuke Hirose;S. Honma;H. Fukami;Kazunori Takagi;T. Matsuya;Y. Shigenaga
关于支配颞肌的运动神经元和纺锤体传入神经的生理学和形态以及两者之间的突触连接知之甚少。本研究旨在通过使用细胞内记录和辣根过氧化物酶或生物素酰胺标记技术，并使用琥珀胆碱（SCh）对猫的纺锤体传入神经进行分类，在光学显微镜水平上研究上述问题。颞肌运动神经元具有从球形到蛋形的树突树。对于由靠近核边界的运动神经元形成的树突树来说，形状变形更为突出。没有检测到运动神经元的轴突侧支。根据 SCh 输注后的动态指数值，颞肌纺锤体传入神经被分为两个群体：假定的 Ia 组和 II 组。纺锤体传入神经主要终止于三叉神经上核 (Vsup)、h 区和三叉神经运动核 (Vmo) 的背外侧细分 (Vmo.dl)。 Vsup 中 Ia 组传入神经末梢的比例低于 II 组传入神经末梢的比例。在 Vmo.dl 中，Ia 组传入末端的比例在整个细胞核中几乎均匀，但 II 组传入末端的比例在更外围的区域有所增加。 Ia 组 Vmo.dl 中心区域末端分布的比例高于 II 组。 Ia 组的运动神经元上的单纺锤体传入产生的接触（假定的突触）频率高于 II 组。本研究提供的证据表明 Ia 组和 II 组之间纺锤体传入神经元的中央组织是不同的。 J.Comp。内罗尔。 406:29–50, 1999。© 1999 Wiley-Liss, Inc.
Little is known about physiology and morphology of motoneurons and spindle afferents innervating the temporalis and on synaptic connections made between the two. The present study was aimed at investigating the above issues at the light microscopic level by using the intracellular recording and horseradish peroxidase or biotinamide labeling techniques and by the use of succinylcholine (SCh) for the classification of spindle afferents in the cat. Temporalis motoneurons had dendritic trees that ranged from a spherical form to an egg‐shaped form. The shape deformation was more prominent for the dendritic trees made by motoneurons located closer to the nuclear border. No axon collaterals of the motoneurons were detected. On the basis of the values for the dynamic index after SCh infusion, temporalis spindle afferents were classified into two populations: presumptive groups Ia and II. The spindle afferents terminated mainly in the supratrigeminal nucleus (Vsup), region h, and the dorsolateral subdivision (Vmo.dl) of the trigeminal motor nucleus (Vmo). The proportion of group Ia afferent terminals was lower in the Vsup than that of group II afferents. In the Vmo.dl, the proportion of group Ia afferent terminals was nearly even throughout the nucleus, but that of group II afferent terminals increased in the more outlying regions. The proportion of terminal distribution in the central region of Vmo.dl was higher for group Ia than group II. The frequency of contacts (presumptive synapses) made by a single spindle afferent on a motoneuron was higher for group Ia than group II. The present study provided evidence that the central organization of spindle afferent neurons is different between groups Ia and II. J. Comp. Neurol. 406:29–50, 1999. © 1999 Wiley‐Liss, Inc.
小腿三头肌运动神经元中单纤维纺锤体 II 组 EPSP 的特性。
影响因子：
2.5
作者：
Munson,JB;Fleshman,JW;Sypert,GW
通讯作者：
Sypert,GW