Definition and novel connections of the entopallium in the pigeon (Columba livia)
Definition and novel connections of the entopallium in the pigeon (Columba livia)
复制标题
DOI：
10.1002/cne.20627
复制
发表时间：
2005-09-12
影响因子：
2.5
通讯作者：
Wild, JM
中科院分区：
文献类型：
--
作者：
Krützfeldt, NOE;Wild, JM
鸟类内皮层（E）是端脑内离顶盖视觉系统的主要丘脑接收区。由于这种核质量在鸽子的结构的差异，并在最近的证据有关的其他鸟类物种的内腭预测，我们在这里重新定义和图表中的一些新的内腭预测在鸽子的细胞色素氧化酶（CO）的活性，钙结合蛋白免疫组化（CBPi），正常的组织学，和道跟踪的组合。我们发现：1）E是由CO活性和丘脑的致密末端的精确重叠定义的。（圆形）传出; 2）围内皮层（epientopallium，Ep），E的上覆带区域，接收相对稀疏的圆形输入，并且是向半球更广泛区域投射的主要来源;和3）E可以基于正常组织学、CBPi和差异投影被细分为内部（Ei）和外部（Ex）部分。因此，Ei，而不是Ex，使一个相互连接的腹外侧mesopallium一个独特的核，是一个主要来源的投影到侧纹状体。这些发现表明，有必要对最初提出的视觉信息通过内腭复合体和半球的其他区域严格连续流动的观点进行修订，还需要修改长期存在的观点，即E仅与哺乳动物纹外视觉皮层的一个特定层（IV）相当（Karten和霍多斯[1970] J. Comp. Neurol. 140：35-51; Shimizu和Karten [1990]在：Finlay BL等人，编辑。新大脑皮层。纽约：Plenum Press.第75-86页）。相反，E似乎是由各种类型的神经元可能相当于那些在几个新皮层。
The avian entopallium (E) is the major thalamorecipient zone, within the telencephalon, of the tectofugal visual system. Because of discrepancies concerning the structure of this nuclear mass in pigeons, and in light of recent evidence concerning entopallial projections in other avian species, we here redefine and chart some novel entopallial projections in the pigeon by using a combination of cytochrome oxidase (CO) activity, calcium binding protein immunohistochemistry (CBPi), normal histology, and tract tracing. We show that 1) E is defined by the accurate overlap of CO activity and the dense terminations of thalamic (rotundal) efferents; 2) the perientopallium (Ep), E's overlying belt region, receives a relatively sparse rotundal input and is a major source of projections to wider regions of the hemisphere; and 3) E can be subdivided into internal (Ei) and external (Ex) portions on the basis of normal histology, CBPi, and differential projections. Thus, Ei, but not Ex, makes a reciprocal connection with a distinct nucleus in the ventrolateral mesopallium and is a major source of projections to the lateral striatum. These findings suggest the necessity for a revision of the original proposal of a strictly serial flow of visual information through the entopallial complex and further regions of the hemisphere and also require a modification of the long-standing view that E is comparable to only one specific lamina (IV) of extrastriate visual cortex of mammals (Karten and Hodos [1970] J. Comp. Neurol. 140:35-51; Shimizu and Karten [1990] In: Finlay BL, et al., editors. The neocortex. New York: Plenum Press. p 75-86). Rather, E appears to be composed of a variety of neuronal types possibly equivalent to those in several neocortical laminae.