ORGANIZATION OF TECTOFUGAL VISUAL PATHWAY IN PIGEON - RETROGRADE TRANSPORT STUDY
ORGANIZATION OF TECTOFUGAL VISUAL PATHWAY IN PIGEON - RETROGRADE TRANSPORT STUDY
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DOI：
10.1002/cne.901670407
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发表时间：
1976-01-01
影响因子：
2.5
通讯作者：
KARTEN, HJ
中科院分区：
文献类型：
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作者：
BENOWITZ, LI;KARTEN, HJ
在鸟类中，视顶盖的浅层接受大量的视网膜输入。顶盖反过来投射到丘脑圆核上，然后丘脑将其传出信号发送到端脑的外纹状体核心。为了检查这一主要上升视觉通路的详细组织，在鸽子整个外纹状体 (E) 或圆核 (Rt) 的不同部位注射了标记辣根过氧化物酶 (HRP)。对逆行标记所得模式的分析表明，顶盖通路由至少 5 个不同的通道组成。位于顶盖中央灰层（SGC）不同深度的细胞投射到圆核的不同细分上。 Rt 的前部接收来自 SGC 中最浅层细胞的输入，而 Rt 的内侧和尾部则由更深的 SGC 神经元投射。 Rt 的腹侧细分接收来自 2 个顶盖前核的主要输入。 Rt 所有部分的额外输入均来自丘脑上网状核。圆体的各种细分依次投射到 E 的不同部分。Rt 的不同输入类别之间的隔离很大程度上保留在端脑水平。三角核是 Rt 的背内侧延伸部分，它接收来自所有 SGC 神经元最深处的输入，并将其传出信号发送到 E 的所有部分。
In birds superficial laminae of the optic tectum receive a massive retinal input; the tectum in turn projects upon the nucleus rotundus thalami, which then sends its efferents to the ectostriatal core of the telencephalon. To examine the detailed organization of this principal ascending visual pathway, small injections of the marker horseradish peroxidase (HRP) were placed in various sites throughout the ectostriatum (E) or nucleus rotundus (Rt) in pigeons. Analysis of the resulting patterns of retrograde labeling indicated the tectofugal pathway to be comprised of at least 5 different channels. Cells which lie at various depths in the stratum griseum centrale (SGC) of the tectum project upon distinct subdivisions of nucleus rotundus. Anterior portions of Rt receive input from superficial-most cells in the SGC, while medial and more caudal portions of Rt are projected upon by deeper SGC neurons. A ventral subdivision of Rt received its primary input from 2 pretectal nuclei. Additional inputs to all portions of Rt arise from nucleus reticularis superior thalami. The various subdivisions of rotundus in turn project upon distinct portions of the E. The segregation between the different input classes into Rt is largely retained at the telencephalic level. The nucleus triangularis, a dorso-medial extension of Rt which receives its input from the deepest of all SGC neurons, sends its efferents to all parts of the E.