Winer J A, Wenstrup J J
Department of Molecular and Cell Biology University of California at Berkeley 94720-3200.
J Comp Neurol. 1994 Aug 8;346(2):161-82. doi: 10.1002/cne.903460202.
The cytoarchitectonic organization of the medial geniculate body and adjoining thalamic nuclei was analyzed in the mustached bat (Pteronotus parnellii). These subdivisions provide a reference for structural, physiological, connectional, and neurochemical work. Most nuclei recognized in other mammals exist in the mustached bat, although the relative volume of the three divisions was species specific. The ventral division contains medium-sized neurons and a few smaller cells and is well developed. Neurons in the lateral part lie in regularly aligned rows corresponding to the laminae in Golgi material; in the medial part, these laminae are obscured by fibers. The dorsal division has at least four nuclei, each with a unique cytoarchitecture and myeloarchitectonic organization. The suprageniculate nucleus is prominent and has many large radiate neurons. Cells in the superficial dorsal nucleus have weekly laminated dendrites, while dorsal nucleus neurons have spherical dendritic fields. There is a wide range of neuropil patterns within the dorsal division. The suprageniculate nucleus has thick myelinated axons, while the fibers in the superficial and dorsal nuclei are much thinner. The rostral pole nucleus becomes prominent in the anterior one-half of the auditory thalamus; its architectonic affiliation is equivocal, and connectional and immunocytochemical studies suggest that it may belong to the dorsal division. The medial division is one nucleus with many types of neurons, and it has coarse axons without laminar orientation. It is the smallest of the divisions and is present throughout the medial geniculate complex, except at the caudal tip and at the rostral pole. Many features of medial geniculate body organization evident in other mammals are recognized in the mustached bat. These include a prominent ventral division, some of whose neurons have a laminar organization, and a comparatively small medial division that is devoid of fibrodendritic laminae. Other features, such as the presence of a large rostral pole nucleus, whose homologue in other species is uncertain, or the sparse number or small cells that may participate in local circuits, set it apart from carnivores and primates and suggest that there are species specific patterns of medial geniculate body organization.
对髭蝠（Pteronotus parnellii）的内侧膝状体及相邻丘脑核团的细胞构筑组织进行了分析。这些亚区为结构、生理、连接和神经化学研究提供了参考。在髭蝠中存在其他哺乳动物中识别出的大多数核团，尽管三个分区的相对体积具有物种特异性。腹侧分区包含中等大小的神经元和一些较小的细胞，且发育良好。外侧部分的神经元呈规则排列的行，与高尔基材料中的板层相对应；在内侧部分，这些板层被纤维遮蔽。背侧分区至少有四个核团，每个核团都有独特的细胞构筑和髓鞘构筑组织。上膝状体核突出，有许多大的辐射状神经元。浅背核中的细胞有弱分层的树突，而背核神经元有球形的树突野。背侧分区内有多种神经毡模式。上膝状体核有粗的有髓轴突，而浅背核和背核中的纤维要细得多。嘴侧极核在听觉丘脑的前半部分变得突出；其构筑归属不明确，连接和免疫细胞化学研究表明它可能属于背侧分区。内侧分区是一个有多种类型神经元的核团，它有粗大的无层状取向的轴突。它是最小的分区，存在于整个内侧膝状体复合体中，除了尾端和嘴侧极。在髭蝠中也能识别出其他哺乳动物中内侧膝状体组织的许多特征。这些特征包括突出的腹侧分区，其一些神经元具有层状组织，以及相对较小的内侧分区，该分区没有纤维树突板层。其他特征，如存在一个大的嘴侧极核，其在其他物种中的同源物不确定，或者可能参与局部回路的细胞数量稀少或体积小，使它与食肉动物和灵长类动物不同，并表明存在内侧膝状体组织的物种特异性模式。
