NEURAL CONNECTIONS OF VISUAL-WULST OF AVIAN TELENCEPHALON - EXPERIMENTAL STUDIES IN PIGEON (COLUMBA-LIVIA) AND OWL (SPEOTYTO-CUNICULARIA)
NEURAL CONNECTIONS OF VISUAL-WULST OF AVIAN TELENCEPHALON - EXPERIMENTAL STUDIES IN PIGEON (COLUMBA-LIVIA) AND OWL (SPEOTYTO-CUNICULARIA)
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DOI：
10.1002/cne.901500303
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发表时间：
1973-01-01
影响因子：
2.5
通讯作者：
REVZIN, AM
中科院分区：
文献类型：
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作者：
KARTEN, HJ;HODOS, W;REVZIN, AM
鸽子和猫头鹰的视网膜纤维都终止于背侧丘脑的多核复合体，包括前外侧核、前背外侧核、前背外侧核、外侧部和大细胞部，并统称为丘脑视主核（OPT）。用Fink-Heimer法追踪OPT的传出投射进入同侧前脑外侧束，并通过背侧视上交叉进入对侧前脑外侧束。OPT投射终止于端脑背侧的隆起或“Wulst”。Wulst是一个多层结构，包含一个深卧的大细胞层，即背侧超纹状体（HD），一个分散的细胞层，即最高层上纹状体（HISm），一个颗粒细胞层或副上纹状体（IHA），一个覆盖的副上纹状体（HA），由一个宽的中等大小的神经元层组成，和一个覆盖的纤维分子层。每一层在猫头鹰中都特别发达，颗粒细胞层可分为内带和外带（IHAex和IHAint）。OPT的投影终止于HD、HISm和IHA。在对侧Wulst也发现了一个同伦投影。终止模式在鸽子和猫头鹰中是相似的，尽管分布模式在猫头鹰中更明显，其巨大的OPT和Wulst。内侧，非视觉，丘脑细胞群在鸽子（核背外侧部内侧和背内侧前）也项目双边的Wulst，但终止于一个更内侧，非视觉和细胞学不同，部分HD。丘脑内侧核的预测并没有重叠的OPT，似乎是一个独立的功能系统，仍然未定的性质。
Retinal fibers in both the pigeon and owl terminate in a multi-nucleate complex of the dorsal thalamus, including the nuclei lateralis anterior, dorsolateralis-anterior, dorsolateralis anterior, pars lateralis et pars magnocellularis, and collectively designated the nucleus opticus principalis thalami (OPT). Efferent projections of OPT were traced with the Fink-Heimer method into the ipsilateral lateral forebrain bundle, and via the dorsal supraoptic decussation, into the contralateral lateral forebrain bundle. OPT projections terminate within an elevation, or “Wulst” on the dorsum of the telencephalon. The Wulst is a multilaminate structure containing a deep lying layer of large cells the hyper-striatum dorsale (HD), a dispersed cell layer—the hyperstriatum intercalatus suprema (HISm), a granule cell layer or nucleus intercalatus hyperstriatum accessorium (IHA), an overlying hyperstriatum accessorium (HA) consisting of a broad layer of medium sized neurons, and an overlying fibro-molecular layer. Each of these laminae are particularly well developed in the owl, where the granule cell layer is divisible into inner and outer bands (IHAex and IHAint). The projections of OPT terminate in the HD, HISm and IHA. A homotopic projection was also found in the contralateral Wulst. The pattern of termination was similar in both the pigeon and the owl, though the pattern of distribution was more apparent in the owl with its massive OPT and Wulst. Medial, nonvisual, thalamic cell groups in the pigeon (nuclei dorsolateralis pars medialis and dorso-medialis anterior) also project bilaterally upon the Wulst, but terminate in a more medial, nonvisual and cytologically different, portion of HD. The projections of the medial thalamic nuclei did not overlap with those of OPT and appear to be a separate functional system of still undetermined nature.