A MORPHOLOGICAL-STUDY OF THE COLLATERAL REINNERVATION OF THE CATS CANINE TOOTH
A MORPHOLOGICAL-STUDY OF THE COLLATERAL REINNERVATION OF THE CATS CANINE TOOTH
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DOI：
10.1016/0014-4886(87)90258-5
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发表时间：
1987-12-01
影响因子：
5.3
通讯作者：
ROBINSON, PP
中科院分区：
文献类型：
--
作者：
HOLLAND, GR;ROBINSON, PP
我们研究了猫犬齿牙髓侧支神经再支配的形态学特征。侧支神经再支配的刺激，在6只成年猫切断同侧下牙槽神经，并防止其再生的尼龙管内密封结扎的神经。15周后用电子显微镜检查犬齿的根尖，并对每个轴突进行计数和测量。与对侧对照牙齿相比，侧支神经再支配由更少的有髓纤维组成，并且在五只动物中，无髓纤维的数量也更少。在一只动物中，手术侧的无髓鞘计数超过对照侧。轴突的总数是对照牙齿的33.5%，比以前实验中再生纤维再支配后看到的少得多。侧支纤维的结构特征与再生神经纤维相似。与对照组相比，有髓侧支纤维较小，髓鞘较薄。有更多的无髓纤维只包含一个轴突。更多的无髓纤维有暴露的部分轴膜的细胞外空间，也有轴-轴向附着增加。
We examined the morphologic characteristics of the collateral reinnervation of the cat''s canine tooth pulp. Collateral reinnervation was stimulated in six adult cats by transecting the ipsilateral inferior alveolar nerve and preventing it from regenerating by sealing the ligated nerve inside a nylon tube. The apices of the canine teeth were examined after 15 weeks using electron microscopy and each axon was counted and measured. Compared with contralateral control teeth, the collateral reinnervation consisted of fewer myelinated fibers and in five animals the number of nonmyelinated fibers was also smaller. In one animal the nonmyelinated count on the operated side exceeded that on the control side. The total number of axons was 33.5% of the number in control teeth, considerably fewer than seen after reinnervation by regenerating fibers in previous experiments. The structural characteristics of the collateral fibers were similar to those of regenerating nerve fibers. Compared with controls the myelinated collateral fibers were smaller and had thinner myelin sheaths. There were more nonmyelinated fibers containing only one axon. More nonmyelinated fibers had exposure of part of their axolemma to the extracellular space and there was also an increase in axoaxonal apposition.