MORPHOLOGY OF JAW-MUSCLE SPINDLE AFFERENTS IN THE RAT
MORPHOLOGY OF JAW-MUSCLE SPINDLE AFFERENTS IN THE RAT
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DOI：
10.1002/cne.902820306
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发表时间：
1989-04-15
影响因子：
2.5
通讯作者：
TAYLOR, A
中科院分区：
文献类型：
--
作者：
DESSEM, D;TAYLOR, A
通过轴突内注射辣根过氧化物酶研究了大鼠颌肌纺锤体传入神经的形态。所有染色的轴突均位于三叉神经的运动根，并可向背侧追踪至三叉神经运动核附近，在那里它们分为中脑核束中的升支和PRbost束中的降支。轴突侧枝和细侧枝上的肿胀被认为是突触纽扣，位于以下区域：三叉神经运动核、三叉神经运动核背侧区域，包括三叉上核、紧邻三叉神经运动核尾部的小细胞网状结构、面核水平的网状结构和 中脑核的尾部。没有观察到向小脑投射的证据。布顿在三叉神经运动核周围的区域最多，尤其是背部。在这里，它们没有被证明与复染细胞非常接近，因此无法确定有多少接触点位于该区域的细胞上以及有多少接触点位于三叉神经运动神经元的远端树突上。位于三叉神经运动核的布顿总是局限于核的一小部分，并且明显大于位于背侧的布顿。一些纽扣被发现与三叉神经运动神经元紧密相连，可能会产生躯体接触。这些结果表明，颌肌梭传入神经仅与有限数量的三叉神经运动神经元进行体细胞和近端树突接触，并且还投射到运动神经核背侧和尾侧的咀嚼中间神经元区域。
The morphology of jaw-muscle spindle afferents in the rat has been studied by intra-axonal injection of horseradish peroxidase. All stained axons were located in the motor root of the trigeminal nerve and could be traced dorsomedially to the vicinity of the trigeminal motor nucleus, where they divided into an ascending branch in the tract of the mesencephalic nucleus and a descending branch in the tract of PRbost. Axon collaterals and swellings on fine collateral branches presumed to be synaptic boutons were located in the following regions: the trigeminal motor nucleus, the region dorsal to the trigeminal motor nucleus including the supratrigeminal nucleus, the parvicellular reticular formation immediately caudal to the trigeminal motor nucleus, the riticular formation at the level of the facial nucleus, and the caudal portion of the mesencephalic nucleus. No evidence of a projection to the cerebellum was observed. Boutons were most numerous in the region surrounding the trigeminal motor nucleus, especially dorsally. Here they were not demonstrated in close proximity to counterstained cells, and therefore it was not possible to determine how many of these contacts are located on cells in this region and how many are on the distal dendrites of trigeminal motorneurons. Boutons located with the trigeminal motor nucleus were always confined to a small portion of the nucleus and were significantly larger than those located dorsally. Some boutons were found in close apposition to trigeminal motor-neurons and presumably make somatic contacts. These results suggest the jaw-muscle spindle afferents make somatic and proximal dendritic contacts with only a limited number of trigeminal motorneurons and also project to masticatory interneuronal regions dorsal and caudal to the motor necleus.