Anatomical studies of the primary facial taste center in fish

对不同鱼种的面部初级味觉中枢(面部叶)的一般结构进行了组织学研究。结果表明，面叶的组织类型有6种：单柱型、2小叶型、3小叶型、5小叶型、融合型和乳房型。单柱型由位于第四脑室附近的双侧对称柱组成。前部、中部和后部分别接受面神经、舌咽神经和迷走神经的投射。为了绘制体位图，用…跨神经节示踪技术研究了3种叉尾的面神经各分支的中枢投射更多的辣根过氧化物酶。眼镜蛇、海龙和斜纹夜蛾分别具有2个、3-4个和5个小叶类型的FL。每个小叶是一个纵向的亚柱，在FL的后部变得不清楚。对神经纤维的追踪显示，除背外侧小叶外，每个小叶都接受单个触须的输入。例如，Plotosus的四个大致相等的纵向副柱分别来自四个大小相似的触须，第五列代表侧翼。另一方面，Arius的长、中、短亚柱分别接受上颌长、下颌中外侧和下颌短内侧触须的投射。这些结果清楚地表明，在三种鱼类中发现的FL的多种小叶类型与触须的数量和长度有关，并且FL的体位组织在三种鱼中基本相同。在FL中，触须的前后轴在同一轴上，而在FL中，前-后轴在后-前轴上。较少

General structures of the primary facial taste center (facial lobe) were histologically examined in various species of fish. The results show 6 types of the facial lobe (FL) organization: single column type, two lobule type, three lobule type, five lobule type, fusion type and maminar type. The single column type consists of the bilaterally symmetric column located adjacent to the fourth ventricle. The anterior, intermediate and posterior portions of the column receive projections mainly from the facial, glossopharyngeal and vagal nerves, respectively. The single column is considered to be the most primitive and may differentiate into fusion type, multiple lobule types or lamina typeswhich are found in cyprinid fish, catfish and goatfish, respectively.In order to the somatotopic map, the central projections of various branches of the facial nerve were examined in three species of catfish, Parasilurus asotus, Plotosus lineatus, Arius felis by using technique of transganglionic tracing w … More ith horseradish peroxidase. The Parasilurus, Arius and Plotosus have two, three-four and five lobule type of the FL, respectively. Each lobule is a longitudinal subcolumn and become unclear in the posterior region of the FL. Tracing of nerve fibers shows that each lobule except the laterodorsal lobule receives input of a single barbel. For example, the four roughly equal, Longitudinal subcolumns of the Plotosus have input from four similarly-sized barbels, respectively and a fifth column represents the flank. On the other hand, the long, medium and short subcolumns of the Arius receive projections from the long maxillary, medium lateral mandibular and short medial mandibular barbels, respectively. These results clearly show that the multiple lobule types of the FL found in the catfishes is related to the number and length of the barbels, and that the somatotopic organization of the FL is essentially the same among the three species. The anterior-posterior axis of the barbels is represented in the FL in the same axis, while the anterior-posterior axis is represented in the FL in a posterior-anterior axis. Less