DIFFERENTIAL INNERVATION PATTERNS OF 3 DIVISIONS OF FROG AUDITORY MIDBRAIN (TORUS SEMICIRCULARIS)
DIFFERENTIAL INNERVATION PATTERNS OF 3 DIVISIONS OF FROG AUDITORY MIDBRAIN (TORUS SEMICIRCULARIS)
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DOI：
10.1002/cne.903060407
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发表时间：
1991-04-22
影响因子：
2.5
通讯作者：
LIN, WY
中科院分区：
文献类型：
--
作者：
FENG, AS;LIN, WY
本文研究了蛙类半圆环(TS)的板层核、主核和大细胞核的连接模式。少量辣根过氧化物酶被局部注射到TS的各个分区，观察到顺行和逆行运输模式。我们的追踪研究结果表明，TS的这些分支具有明显的神经支配模式。主核似乎是TS的主要输入端口，接受来自双侧所有脑干尾侧听核的广泛传入，尤其是来自对侧延髓背侧核和同侧上橄榄核和丘系外侧核的传入。向该核的下行投射仅限于丘脑后核。相反，板状核，但更明显的是大细胞核，从丘脑背侧的许多结构接受广泛的下行传入，从脑干尾侧听核接受不太明显的上行传入。与传入联系模式类似，来自这三个胸肌分支的传出投射也有很大的不同。主核给出有限的上行投射，主要局限于丘脑后核的尾侧区域，这是处理复杂声音频谱信息的重要区域，以及顶盖前灰质。其下行投射也受到一定程度的限制，仅限于上橄榄核和外侧丘脑核。板状核，特别是大细胞核，既有向下的投射，也有向上的投射；这些核团是TS的主要输出通路，也是听觉输入到达丘脑中央核的主要通路，该结构以前被认为参与了时间信息的处理。
The connectivity pattern of the laminar, principal, and magnocellular nuclei of the frog torus semicircularis (TS) was investigated. A small amount of horseradish peroxidase was injected focally into individual divisions of the TS and anterograde and retrograde transport patterns were observed. Results of our tracing study showed that these divisions of the TS possessed distinct innervation patterns. The principal nucleus appeared to be the primary input port of the TS receiving extensive inputs from all caudal brainstem auditory nuclei bilaterally, but especially from the contralateral dorsal medullary nucleus and the ipsilateral superior olivary and lateral lemniscus nuclei. Descending projection to this nucleus was limited to that from the posterior thalamic nucleus. In contrast, the laminar nucleus, but even more markedly the magnocellular nucleus, received extensive descending inputs from numerous structures in the dorsal thalamus and less pronounced ascending afferents from caudal brainstem auditory nuclei. Similar to the afferent connection patterns, the efferent projections originating from these three toral divisions differed substantially. The principal nucleus gave restricted ascending projections, limited mainly to the caudal region of the posterior thalamic nucleus, a region important in processing spectral information of complex sounds, and the pretectal gray. Its descending projection was also somewhat restricted, being limited to the superior olivary and lateral lemniscus nuclei. The laminar nucleus and especially the magnocellular nucleus gave robust descending as well as ascending projections; these nuclei serve as the main output paths for the TS and provide the main routes by which auditory input reaches the central thalamic nucleus, a structure previously shown to be involved in temporal information processing.