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首页> 外文期刊>The European Journal of Neuroscience >Functional organization of auditory cortex in the Mongolian gerbil (Meriones unguiculatus). IV. Connections with anatomically characterized subcortical structures.
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Functional organization of auditory cortex in the Mongolian gerbil (Meriones unguiculatus). IV. Connections with anatomically characterized subcortical structures.

机译：蒙古沙鼠（Meriones unguiculatus）的听觉皮层的功能组织。 IV。具有解剖学特征的皮层下结构的连接。

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The subcortical connections of the four tonotopically organized fields of the auditory cortex of the Mongolian gerbil, namely the primary (AI), the anterior (AAF), the dorsoposterior (DP) and the ventroposterior field (VP), were studied predominantly by anterograde transport of biocytin injected into these fields. In order to allow the localization of connections with respect to subdivisions of subcortical auditory structures, their cyto-, fibre- and chemoarchitecture was characterized using staining methods for cell bodies, myelin and the calcium-binding protein parvalbumin. Each injected auditory cortical field has substantial and reciprocal connections with each of the three subdivision of the medial geniculate body (MGB), namely the ventral (MGv), dorsal (MGd) and medial division (MGm). However, the relative strengths of these connections vary: AI is predominantly connected with MGv, AAF with MGm and MGv, and DP and VP with MGd and MGv. The connections of at least AI and MGv are topographic: injections into caudal low-frequency AI label laterorostral portions of MGv, whereas injections into rostral high-frequency AI label mediocaudal portions of MGv. All investigated auditory fields send axons to the suprageniculate, posterior limitans, laterodorsal and lateral posterior thalamic nuclei, with strongest projections from DP and VP, as well as to the reticular and subgeniculate thalamic nuclei. AI, AAF, DP and VP project to all three subdivisions of the inferior colliculus, namely the dorsal cortex, external cortex and central nucleus ipsilaterally and to the dorsal and external cortex contralaterally. They also project to the deep and intermediate layers of the ipsilateral superior colliculus, with strongest projections from DP and VP to the lateral and basolateral amygdaloid nuclei, the caudate putamen, globus pallidus and the pontine nuclei. In addition, AAF and particularly DP and VP project to paralemniscal regions around the dorsal nucleus of the lateral lemniscus (DNLL), to the DNLL itself and to the rostroventral aspect of the superior olivary complex. Moreover, DP and VP send axons to the dorsal lateral geniculate nucleus. The differences with respect to the existence and/or relative strengths of subcortical connections of the examined auditory cortical fields suggest a somewhat different function of each of these fields in auditory processing.
机译：主要通过顺行运输研究了蒙古沙鼠听觉皮层的四个拓扑学上有组织的皮层下连接，即主（AI），前（AAF），后后（DP）和后后方（VP）。注入这些领域的生物素。为了使连接相对于皮层下听觉结构的细分定位，使用细胞体，髓磷脂和钙结合蛋白小白蛋白的染色方法对它们的细胞，纤维和化学结构进行了表征。每个注射的听觉皮层视野都与内侧膝状体（MGB）的三个细分，即腹侧（MGv），背侧（MGd）和内侧分裂（MGm）的每个部分具有实质性和相互联系。但是，这些连接的相对强度各不相同：AI主要与MGv连接，AAF与MGm和MGv连接，而DP和VP与MGd和MGv连接。至少AI和MGv的连接在地形上：注入MGv的尾部低频AI标签后腹部分，而注入MGv的尾部高频AI标签中尾部分。所有已调查的听觉场均将轴突发送至丘脑上，后限，丘脑后外侧和外侧后丘脑核，其中DP和VP的投射最强，以及网状和亚丘脑的丘脑核。 AI，AAF，DP和VP分别投射到下丘的所有三个细分部分，即同侧的背侧皮质，外部皮层和中核，以及对侧的背侧和外部皮层。它们还投射到同侧上丘的深层和中间层，从DP和VP到外侧和基底外侧的杏仁核，尾状壳核，苍白球和桥脑核的投射最强。此外，AAF，尤其是DP和VP投射到侧弯盘菌（DNLL）背核周围的椎旁盘区，DNLL本身以及上橄榄复合体的腹腔侧面。此外，DP和VP将轴突发送到背外侧膝状核。关于所检查的听觉皮层区域的皮层下连接的存在和/或相对强度的差异表明，这些区域在听觉处理中的功能有所不同。

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