QUANTITATIVE-ANALYSES OF FIBER POPULATION IN RAT CHORDA TYMPANI NERVES AND FUNGIFORM PAPILLAE
QUANTITATIVE-ANALYSES OF FIBER POPULATION IN RAT CHORDA TYMPANI NERVES AND FUNGIFORM PAPILLAE
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DOI：
10.1002/aja.1001530403
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发表时间：
1978-01-01
影响因子：
--
通讯作者：
HELLEKANT, G
中科院分区：
文献类型：
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作者：
FARBMAN, AI;HELLEKANT, G
对34只大鼠44条完整的鼓索神经(CT)的横断面进行了电子显微蒙太奇计数。平均纤维数为1096根，其中有髓纤维641根，无髓纤维455根。左右两侧CT的平均纤维数无显著差异，中耳CT节段与CT与舌神经交界处近侧CT节段的计数也无显著差异。在13只动物中评估了传出和传入纤维在CT中的相对贡献。行颅脑手术，切开右侧面神经根入内耳道的近端。19-21天后，为了允许传出纤维的沃勒变性，进行了计数。大鼠CT的平均传入纤维数为484个有髓纤维和122个无髓纤维(共606个)；同一动物完整的左侧CT平均含有616个有髓纤维和402个无髓纤维(共1018个)。CT的传入纤维占有髓纤维总数的79%，仅占无髓纤维总数的30%。切除颈上交感神经节对神经纤维数量无明显影响。本文比较了去传出大鼠舌的菌状乳头中CT纤维的数量与对照大鼠舌部的CT纤维的数量。为了进行这一比较，有必要切断舌神经，它约占菌状乳头纤维总数的75%。这是在对照和去流出的动物身上完成的。去传出CT支配的菌状乳头与完整CT支配的菌状乳头的平均纤维数无显著差异。没有证据表明菌状乳头内存在传出CT成分。
The numbers of nerve fibers in 44 intact chorda tympani nerves (CT) from 34 rats were counted on electron micrographic montages of cross-sections of the nerves. The mean number of fibers was 1096, consisting of 641 myelinated and 455 unmyelinated fibers. There was no significant difference in the mean number of fibers between CT from right and left sides, nor was there any significant difference in counts between CT segments taken from the middle ear and those taken from just proximal to the region where the CT joins the lingual nerve. The relative contribution of efferent and afferent fibers in the CT was assessed in 13 animals. Intracranial surgery was performed to cut the root of the facial nerve just proximal to its entrance into the internal auditory meatus on the right side. After 19-21 days, to allow Wallerian degeneration of the efferent fibers, counts were made. The mean number of afferent fibers in the rat CT was 484 myelinated and 122 unmyelinated (606 total); the intact left CT from the same animals contained a mean of 616 meylinated and 402 unmyelinated (1018 total) fibers. The afferent limb of the CT contains 79% of the total number of myelinated fibers and only 30% of the total number of unmyelinated fibers. Removal of the superior cervical sympathetic ganglion did not significantly affect the numbers of fibers. Whether the efferent limb of the CT contributes fibers to the fungiform papillae on the tongue, the number of (CT) fibers in fungiform papillae from de-efferented rat tongues was compared with that from papillae of controls. To make this comparison, it was necessary to section the lingual nerve, which contributes about 75% of the total number of fibers to the fungiform papillae. This was done in the control and de-efferented animals. There was no significant difference in mean number of fibers in fungiform papillae innervated by a de-efferented CT when compared with those innervated by an intact CT. There is no evidence to suggest the presence of an efferent CT component within the fungiform papilla.