Kiyohara S, Shiratani T, Yamashita S
Brain Res. 1985 Jan 28;325(1-2):57-69. doi: 10.1016/0006-8993(85)90302-6.
The major pathways of the peripheral facial taste system in the carp, Cyprinus carpio, are the maxillary (Max), mandibular (Mand), palatine (Pal) and recurrent nerve rami. The peripheral distribution of the sensory fibers of these branches (B) was determined by means of electrophysiological techniques. Max.B., Mand.B. and Pal.B., each of which arises from the gasserian-geniculate ganglionic complexes, were found to innervate respectively, the upper lip and the adjacent skin, the internal and external surface of the lower lip region, and the upper lip and the anterior palate, ipsilaterally. The recurrent nerve sends fibers mainly via dorsal and ventral branches of the posterior lateral line nerve (NPLL), and a pectoral branch of the occipito-spinal nerve. The dorsal and ventral branches of NPLL innervate respectively, the dorsal fin and the adjacent body surface, and the remainder of the body surface. The pectoral branch supplies the pectoral fin. The central connections of the above branches were also examined by using the techniques of transganglionic tracing with horseradish peroxidase (HRP). HRP was applied to each of the branches, and its penetration of the brainstem was carefully followed. Labeled fibers were observed only in the ipsilateral region of the brainstem. When Max.B or Mand.B. was treated with HRP, labeled fibers were observed in the facial sensory root and in the descending trigeminal root. When Pal.B. was treated, however, they were traced only to the facial sensory root; thus indicating that the former two branches are trigeminofacial complexes and the latter is a pure facial nerve. Labeled fibers for NPLL were found in the facial sensory root as well as in bundles projecting to the lateral line areas. The facial fibers of Max.B. and Mand.B. innervate respectively in the dorsal-intermediate portion of the rostral half of the facial lobe, and in the ventral portion of the caudal half of the lobe. Those of Pal.B. however, cover a large area of the lobe anteroposteriorly except for the dorsal and ventral portions. The recurrent fibers of NPLL and the pectoral B. end in the dorsal-medial portion of the caudal half of the lobe. Thus the results of this study show that there is a topographical relation between the receptive field of the 6 peripheral nerve branches and their locus of representation in the facial lobe. Similarly, that the gustatory system through Pal.B. is represented on the facial lobe in a disproportionately large area compared to that of the other 5 branches.
鲤鱼（Cyprinus carpio）外周面神经味觉系统的主要通路是上颌神经（Max）、下颌神经（Mand）、腭神经（Pal）和返神经支。利用电生理技术确定了这些分支（B）感觉纤维的外周分布。发现分别起源于三叉神经节-膝状神经节复合体的Max.B、Mand.B和Pal.B分别同侧支配上唇及相邻皮肤、下唇区域的内表面和外表面，以及上唇和前腭。返神经主要通过后侧线神经（NPLL）的背支和腹支以及枕-脊髓神经的胸鳍支发送纤维。NPLL的背支和腹支分别支配背鳍及相邻体表和身体其余体表。胸鳍支供应胸鳍。还使用辣根过氧化物酶（HRP）跨神经节追踪技术检查了上述分支的中枢连接。将HRP应用于每个分支，并仔细追踪其在脑干中的穿透情况。仅在脑干的同侧区域观察到标记纤维。当用HRP处理Max.B或Mand.B时，在面神经感觉根和三叉神经降根中观察到标记纤维。然而，当处理Pal.B时，它们仅追踪到面神经感觉根；因此表明前两个分支是三叉-面神经复合体，后者是纯面神经。在面神经感觉根以及投射到侧线区域的束中发现了NPLL的标记纤维。Max.B和Mand.B的面神经纤维分别支配面神经叶吻侧半的背中间部分和叶尾侧半的腹侧部分。然而，Pal.B的纤维除了背侧和腹侧部分外，在叶的前后方向覆盖了很大区域。NPLL的返行纤维和胸鳍支在叶尾侧半部分的背内侧终止。因此，本研究结果表明，6个外周神经分支的感受野与其在面神经叶中的代表位点之间存在拓扑关系。同样，与其他5个分支相比，通过Pal.B的味觉系统在面神经叶上的代表区域不成比例地大。
