Kanwal J S, Finger T E, Caprio J
Department of Zoology and Physiology, Louisiana State University, Baton Rouge 70803.
J Comp Neurol. 1988 Dec 15;278(3):353-76. doi: 10.1002/cne.902780306.
Horseradish peroxidase tracing and extracellular electrophysiological recording techniques were employed to delineate prosencephalic connections of the gustatory system in ictalurid catfishes. The isthmic secondary gustatory nucleus projects rostrally to several areas of the ventral diencephalon including the nucleus lobobulbaris and the nucleus lateralis thalami. Injections of HRP in the vicinity of the nucleus lobobulbaris reveal an ascending projection to the telencephalon terminating in the area dorsalis pars medialis (Dm) and the medial region of area dorsalis pars centralis (Dc). Conversely, injections of HRP into the gustatory region of area dorsalis pars medialis label small neurons in the nucleus lobobulbaris. Gustatory neurons in the telencephalon send descending projections via the medial and lateral forebrain bundles to several nuclei in the anterior and ventroposterior diencephalon. The nucleus lateralis thalami, a diencephalic nucleus, receives ascending gustatory projections from the secondary gustatory nucleus but does not project to the telencephalon. Neurons in both the nucleus lateralis thalami and the telencephalic gustatory target exhibit multiple extraoral and oral receptive fields and complex responses to chemical (taste) and tactile stimulation.
采用辣根过氧化物酶示踪和细胞外电生理记录技术，描绘了鲶鱼味觉系统的前脑连接。峡部次级味觉核向前投射至腹侧间脑的几个区域，包括延髓叶核和丘脑外侧核。在延髓叶核附近注射辣根过氧化物酶显示有一条向端脑的上行投射，终止于背侧内侧部（Dm）和背侧中央部（Dc）的内侧区域。相反，向背侧内侧部味觉区域注射辣根过氧化物酶会标记延髓叶核中的小神经元。端脑的味觉神经元通过内侧和外侧前脑束向间脑前部和腹后间脑的几个核发出下行投射。丘脑外侧核，一个间脑核，接受来自次级味觉核的上行味觉投射，但不投射到端脑。丘脑外侧核和端脑味觉靶点中的神经元均表现出多个口外和口内感受野以及对化学（味觉）和触觉刺激的复杂反应。
