Central connections of the posterior lateral line lobe in mormyrid fish
Central connections of the posterior lateral line lobe in mormyrid fish
复制标题
斑鸠鱼后侧线叶的中央连接
DOI：
10.1007/bf00235724
复制
发表时间：
2004
影响因子：
2
通讯作者：
C. J. Russell
中科院分区：
文献类型：
--
作者：
C. Bell;T. Finger;C. J. Russell
在电感受性硬骨鱼中，初级电感受器传入终止于后外侧线叶(PLLL)。本文用辣根过氧化物酶和氚氨基酸示踪技术研究了桑科鱼类PLLL的中枢联系。此外，还观察了与小脑尾叶关系密切的小脑尾叶之间的一些联系。两个接受桑司特受体的输入，一个接受壶腹受体的输入。PLLL固有的带内投影系统将每个区域内的邻接点连接起来。它还通过连合纤维连接身体两侧相应的区域。位于中线同一侧的两个成肌细胞带之间有一个带间系统，投射到PLLL的中枢结构包括尾侧叶、三叉旁外侧核和延髓前核。中脑前外侧核在双侧和躯体上投射到PLLL的低分子层，PLL皮质在双侧和躯体上投射到中脑的两个主要部位：前外侧核和外侧核。在体视学上，PLL皮质各区的对应点投射到外侧核的同一小区域。外侧核有一个大的、在躯体结构上有组织的投射到前脑核。尾叶的传入和传出联系与PLLL相似，提示其与电感觉系统密切相关。解剖学结果表明，来自身体左右两侧的电感觉信息有充分的中枢相互作用的机会。人们可以认为，比较来自双方的传入输入将减少对两者都有同等影响的不显著的差异。结果还表明，存在几个体感组织的反馈环路，它们将电感觉信息的高阶处理结果返回到早期阶段。
SummaryPrimary electroreceptor afferents terminate in the posterior lateral line lobe (PLLL) in electroreceptive teleosts. This paper examines the central connections of PLLL in fish of the family Mormyridae using horseradish peroxidase and tritiated amino acid tracing techniques. Some connections of the closely related lobus caudalis of the cerebellum are also examined.There are three zones on each side of the mormyrid PLLL cortex. Two receive input from mormyromast receptors, and one from ampullary receptors. An intrazonal projection system, intrinsic to PLLL, connects neighboring points within each zone. It also joins corresponding zones on the two sides of the body via commissural fibers. An interzonal system connects the two mormyromast zones on the same side of the midline.Central structures which project to PLLL include lobus caudalis, nucleus paratrigeminalis lateralis, and nucleus praeeminentialis. Nucleus praeeminentialis projects bilaterally and somatotopically to the lower molecular layer of PLLL.PLLL cortex projects bilaterally and somatotopically to two major mesencephalic sites: n. praeeminentialis, and n. lateralis. Somatotopically corresponding points in each zone of PLLL cortex project to the same small region of n. lateralis. Nucleus lateralis has a large and somatotopically organized projection to n. praeeminentialis. The afferent and efferent connections of lobus caudalis are similar to those of PLLL, indicating its close association with the electrosensory system.The anatomical results show that there is ample opportunity for electrosensory information arising on left and right sides of the body to interact centrally. One can suggest that comparison of afferent input from the two sides would reduce the non-significant variability which affects both of them equally. The results also show the presence of several somatotopically organized feedback lops which return the results of higher order processing of electrosensory information to earlier stages.