Projections from dorsomedial part of the subnucleus oralis to the mesencephalic trigeminal neurons innervating the masseter muscle--a PHA-L and HRP double labeling study in the rat.

Journal fur Hirnforschung Pub Date : 1998-01-01
J D Zhang
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Abstract

When PHA-L was injected to dorsomedial part of the subnucleus oralis of the spinal trigeminal nucleus (Vodm), anterogradely labeled varicosities and boutons were observed in the mesencephalic trigeminal nucleus (Vme). The PHA-L labeling was seen mainly in the Vine ipsilateral to the injection side. If the injection sites were placed more medially containing both Vodm and parvocellular reticular nucleus (PCRt), more PHA-L labeling in contralateral Vme was observed. It appeared that the Vodm neurons projected predominantly to the ipsilateral Vme, while neurons in the PCRt adjacent to the Vodm projected bilaterally to the Vme. It was also seen that many PHA-L labeled varicosities and boutons surrounded or contacted on the Vme neurons counterstained with cresyl violet. These contacts were seen frequently in the ipsilateral Vme, occasionally in the contralateral nucleus. Some Vme neurons ipsilateral to the injection side were retrogradely labeled in a solidly-filled appearance following injection of PHA-L into the Vodm. When PHA-L was applied to the Vodm and HRP was injected to the masseter nerve on the same side, the relationship between PHA-L labeled terminals and HRP labeled Vme neurons was studied. The contacts between PHA-L labeled boutons and HRP labeled somata or processes of the Vme neurons were observed occasionally. PHA-L labeled terminals sometimes contacted on none-HRP-labeled somata counterstained with neutral red. Besides the PHA-L labeling in the Vme, the labeling was also seen in the medial parabrachial nucleus ipsilaterally, in the motor trigeminal nucleus bilaterally with ipsilateral predominance. In addition, an outstanding labeling band along the medial border of the principal sensory trigeminal nucleus (Vp) was observed following injection of PHA-L into the Vodm. The labeled terminals were concentrated in dorsomedial part of the Vp (Vpdm) and in juxtatrigeminal nucleus (JX), meanwhile many labeled fibres were distributed between the Vpdm and JX in the intertrigeminal region.

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大鼠口腔亚核背内侧向支配咬肌的中脑三叉神经的投射——PHA-L和HRP双标记研究。
将PHA-L注射到三叉神经脊髓核(Vodm)口侧亚核的背内侧部分,观察到三叉神经中脑核(Vme)呈顺行标记的静脉曲张和扣状。PHA-L标记主要见于注射侧同侧的葡萄藤。如果注射部位位于更中间的位置,同时含有Vodm和旁细胞网状核(PCRt),则观察到对侧Vme中更多的PHA-L标记。Vodm神经元似乎主要投射到同侧Vme,而靠近Vodm的PCRt神经元则向双侧Vme投射。在甲酚紫反染的Vme神经元上,还可见许多PHA-L标记的静脉曲张和扣环包围或接触。这些接触常见于同侧Vme,偶尔见于对侧核。一些注射侧同侧的Vme神经元在向Vodm注射PHA-L后逆行标记为固体填充外观。将PHA-L作用于Vodm,将HRP注射于同侧咬肌神经,研究PHA-L标记终末与HRP标记Vme神经元的关系。偶见PHA-L标记的扣与HRP标记的Vme神经元体突接触。在中性红色反染的非酶标体上,PHA-L标记的末端有时接触。除了在Vme中有PHA-L标记外,在同侧臂旁内侧核也有标记,在双侧三叉神经运动核中也有标记,以同侧为主。此外,在Vodm注射PHA-L后,在三叉神经主感觉核(Vp)内侧边缘观察到明显的标记带。标记末梢集中在Vp背内侧部(Vpdm)和三叉神经旁核(JX),而标记纤维分布在Vpdm和JX之间的三叉神经间区。
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