McCormick C A, Hernandez D V
Department of Biology, Oberlin College, OH 44074, USA.
Brain Behav Evol. 1996;47(3):113-37. doi: 10.1159/000113232.
Cytoarchitectural analyses combined with injections of the tracer horseradish peroxidase in various structures in the brain of the goldfish, Carassius auratus, have defined some of the major components of acoustic and lateral line mechanosensory circuits between the medulla and midbrain. The main acoustic receptor in Carassius, the saccule, is known to provide a major input to the dorsomedial zone of the descending octaval nucleus. The dorsomedial zone in turn projects bilaterally to the secondary octaval population (SO) and to nucleus centralis of the torus semicircularis. The SO is composed of three major subdivisions which are also present in a related otophysan, the catfish Ictalurus punctatus. The SO in Carassius projects bilaterally to nucleus centralis and to the saccular recipient zones of the ipsilateral descending octaval nucleus. By contrast, the mechanosensory lateral line receptors are known to direct most of their input to nucleus medialis. Nucleus medialis in turn projects bilaterally to nucleus praeeminentialis, nucleus ventrolateralis of the torus semicircularis, and the optic tectum, and to the contralateral nucleus medialis. We also provide evidence for a bilateral projection of nucleus medialis to the sensory trigeminal nucleus, and for a reciprocal input from the sensory trigeminal nucleus to the ipsilateral nucleus medialis.
通过对金鱼（Carassius auratus）大脑不同结构进行细胞构筑分析，并结合注射示踪剂辣根过氧化物酶，已明确了延髓和中脑之间听觉及侧线机械感觉回路的一些主要组成部分。已知金鱼的主要听觉感受器球囊向下降八叠体核的背内侧区提供主要输入。背内侧区继而双侧投射至次级八叠体群（SO）和半规管隆起的中央核。SO由三个主要亚区组成，在相关的骨鳔鱼类斑点叉尾鮰中也存在这些亚区。金鱼的SO双侧投射至中央核和同侧下降八叠体核的球囊接受区。相比之下，已知机械感觉侧线感受器将其大部分输入导向内侧核。内侧核继而双侧投射至前 eminent 核、半规管隆起的腹外侧核、视顶盖以及对侧内侧核。我们还提供了内侧核向感觉三叉神经核双侧投射的证据，以及感觉三叉神经核向同侧内侧核相互输入的证据。
