Second tectofugal pathway in a songbird (Taeniopygia guttata) revisited: Tectal and lateral pontine projections to the posterior thalamus, thence to the intermediate nidopallium.
Second tectofugal pathway in a songbird (Taeniopygia guttata) revisited: Tectal and lateral pontine projections to the posterior thalamus, thence to the intermediate nidopallium.
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重新审视鸣禽（Taeniopygia guttata）的第二顶盖通路：顶盖和脑桥外侧投射到后丘脑，然后投射到中间的巢状皮质。
DOI：
10.1002/cne.23886
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Gaede,AndreaH
中科院分区：
文献类型：
--
作者：
Wild,JMartin;Gaede,AndreaH
鸟类几乎总是被认为有两条从视网膜到端脑的视觉通路：丘脑通路（thalamfugal）终止于丘脑下部（Wulst），构造通路（tectofugal）终止于内顶叶（entopallium）。另一个常被忽视的功能通路终止于内顶鞘内侧并与内顶鞘分离（例如，Gamlin and Cohen [1986] J Comp Neurol 250:296-310）。通过使用标准的神经束追踪和电解剖学技术，我们扩展了鸣禽中第二种结构通路的早期证据（Wild [1994] J Comp Neurol 349:512-535），表明斑马雀的视觉投射到后丘脑的uvaeformis核（Uva）的喙侧延伸比Uva更远，这在鸣禽控制系统的背景下被普遍认可。将生物素化右旋糖酐胺注射到侧脑桥核（PL）导致“rUva”的突出，并导致顶盖神经元的广泛逆行标记，主要在第13层。rUva的注射也导致主要是第13层顶盖神经元的广泛逆行标记，PL神经元的逆行标记和PL的顺行标记。因此，似乎一些顶盖神经元可以通过分支轴突投射到rUva和PL。rUva的上升投射终止于中间内顶骨（NI）的视觉反应区域，位于核界面内侧和内顶骨外侧之间。最后，正如Clarke在鸽子中的研究（[1977]J Comp Neurol 174:535-552），我们发现PL投射到尾侧小脑叶。[j] .中国生物医学工程学报，2016。©2015 Wiley期刊公司
Birds are almost always said to have two visual pathways from the retina to the telencephalon: thalamofugal terminating in the Wulst, and tectofugal terminating in the entopallium. Often ignored is a second tectofugal pathway that terminates in the nidopallium medial to and separate from the entopallium (e.g., Gamlin and Cohen [1986] J Comp Neurol 250:296–310). Using standard tract‐tracing and electroanatomical techniques, we extend earlier evidence of a second tectofugal pathway in songbirds (Wild [1994] J Comp Neurol 349:512–535), by showing that visual projections to nucleus uvaeformis (Uva) of the posterior thalamus in zebra finches extend farther rostrally than to Uva, as generally recognized in the context of the song control system. Projections to “rUva” resulted from injections of biotinylated dextran amine into the lateral pontine nucleus (PL), and led to extensive retrograde labeling of tectal neurons, predominantly in layer 13. Injections in rUva also resulted in extensive retrograde labeling of predominantly layer 13 tectal neurons, retrograde labeling of PL neurons, and anterograde labeling of PL. It thus appears that some tectal neurons could project to rUva and PL via branched axons. Ascending projections of rUva terminated throughout a visually responsive region of the intermediate nidopallium (NI) lying between the nucleus interface medially and the entopallium laterally. Lastly, as shown by Clarke in pigeons ([1977] J Comp Neurol 174:535–552), we found that PL projects to caudal cerebellar folia. J. Comp. Neurol. 524:963–985, 2016. © 2015 Wiley Periodicals, Inc.