Projections of the densocellular part of the hyperpallium in the rostral Wulst of pigeons (Columba livia)
Projections of the densocellular part of the hyperpallium in the rostral Wulst of pigeons (Columba livia)
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DOI：
10.1016/j.brainres.2019.01.001
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发表时间：
2019-05-15
期刊：
影响因子：
2.9
通讯作者：
Wild, J. Martin
中科院分区：
文献类型：
--
作者：
Atoji, Yasuro;Wild, J. Martin
鸟类的胃呈四层结构，即顶端部分(HA)、间质部分(IHA)、间质部分(HI)和致密细胞部分(HD)。Wulst由一个较小的吻部体感区域和一个较大的尾部视觉区域组成。视觉HD将视觉信息传递给Wulst中的IHA和HA，也将视觉信息传递到海马结构(Atoji等人，J Comp Neurol 526：146-165,2018)。然而，吻侧HD的纤维通路仍不清楚。本研究结合注射霍乱毒素B亚单位(CTB)逆行追踪和生物素化葡聚糖胺(BDA)顺行追踪相结合的方法，对头端HD和上覆HI的纤维联系进行了分析。当两种示踪剂分别注射到头侧HD时，可以看到与吻侧HA、梨状皮质和海马结构的亚区之间的主要相互联系。巨大纤维的单向投射也到达了内侧纹状体的内侧部分。当CTB和BDA分别注射到吻侧HI时，吻侧HI和HA之间有较强的相互联系，而与Wulst外的区域联系较弱。这些结果表明，在端脑中，头端HD和HI的纤维通路是可以相互区分的，同时也表明，头端HD向头端HA传递信息，并同时作为海马结构的中介体。
The Wulst in birds shows a four-layered structure: apical part of the hyperpallium (HA), interstitial part of HA (IHA), intercalated part of hyperpallium (HI), and densocellular part of hyperpallium (HD). The Wulst consists of a small rostral somatosensory region and a larger caudal visual region. The visual HD relays visual information to IHA and HA in the Wulst and also transfers visual information to the hippocampal formation (Atoji et al., J Comp Neurol 526: 146-165, 2018). However, fiber pathways of the rostral HD remain unknown. In the present study, the fiber connections of the rostral HD and overlying HI were analyzed with tract-tracing techniques using a combination of injections of cholera toxin subunit B (CTB) for retrograde tracing and biotinylated dextran amine (BDA) for anterograde tracing. When the two tracers were bilaterally but separately injected into the rostral HD, major reciprocal connections were seen with the rostral HA, prepiriform cortex, and subdivisions of the hippocampal formation. One-way projections of huge fibers also reached the medial part of the medial striatum. When CTB and BDA were bilaterally and separately injected into the rostral HI, strong reciprocal connections were found between the rostral HI and HA, and weak connections were seen with areas outside the Wulst. These results suggest that the fiber pathways of the rostral HD and HI are distinguishable from each other in the telencephalon and suggest also that the rostral HD relays information to the rostral HA and simultaneously acts as a mediator to the hippocampal formation.