Striedter G F
Department of Neurosciences, University of California, La Jolla.
J Comp Neurol. 1991 Oct 8;312(2):311-31. doi: 10.1002/cne.903120213.
The forebrain auditory, electrosensory, and mechanosensory lateral line pathways in the channel catfish, Ictalurus punctatus, were examined by applying the fluorescent tracer DiI to 1) the auditory part of the torus semicircularis, 2) the electrosensory part of the torus semicircularis, 3) the lateral preglomerular nucleus, and 4) the anterior tuberal nucleus. Three distinct pathways ascend from the torus semicircularis to the telencephalon; they course through either 1) the lateral preglomerular nucleus of the posterior tuberculum, 2) the anterior tuberal nucleus of the hypothalamus, or 3) the central posterior nucleus of the dorsal thalamus. The anatomical data suggest that each of these ascending pathways carries information from more than one sensory modality. The lateral preglomerular nucleus receives an electrosensory input from nucleus electrosensorius in the diencephalon, but it also receives auditory and mechanosensory inputs directly from the torus semicircularis. The anterior tuberal and central posterior nuclei receive primarily auditory and mechanosensory, but also minor electrosensory, inputs. The efferent projections of the central posterior nucleus are presently unknown, but the lateral preglomerular and anterior tuberal nuclei project to nonoverlapping portions of the telencephalon. A cladistic analysis of these indirect torotelencephalic pathways reveals that 1) the pathway through the dorsal thalamus is probably a primitive character for gnathostomes, 2) a well-developed pathway through the posterior tuberculum is probably a derived character for actinopterygian fishes, 3) the pathway through nucleus electrosensorius is probably a derived character for catfishes and gymnotoid teleosts, and 4) auditory pathways through the hypothalamus probably evolved independently in catfishes and frogs.
通过将荧光示踪剂DiI应用于以下部位，对斑点叉尾鮰（Ictalurus punctatus）的前脑听觉、电感觉和机械感觉侧线通路进行了研究：1）半规管隆起的听觉部分；2）半规管隆起的电感觉部分；3）外侧前肾小球核；4）前结节核。从半规管隆起有三条不同的通路向上延伸至端脑；它们分别经过：1）后结节的外侧前肾小球核；2）下丘脑的前结节核；3）背侧丘脑的中央后核。解剖学数据表明，这些上行通路中的每一条都携带来自不止一种感觉模态的信息。外侧前肾小球核从间脑中的电感觉核接收电感觉输入，但它也直接从半规管隆起接收听觉和机械感觉输入。前结节核和中央后核主要接收听觉和机械感觉输入，但也接收少量电感觉输入。中央后核的传出投射目前尚不清楚，但外侧前肾小球核和前结节核投射到端脑的不重叠部分。对这些间接的端脑通路进行的分支分析表明：1）通过背侧丘脑的通路可能是有颌类动物的一个原始特征；2）通过后结节的发育良好的通路可能是辐鳍鱼类的一个衍生特征；3）通过电感觉核的通路可能是鲶鱼和电鳗类硬骨鱼的一个衍生特征；4）通过下丘脑的听觉通路可能在鲶鱼和青蛙中独立进化。
