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首页> 外文期刊>The European Journal of Neuroscience >On the postnatal development of the striate cortex (V1) in the tree shrew (Tupaia belangeri).
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On the postnatal development of the striate cortex (V1) in the tree shrew (Tupaia belangeri).

机译：关于树sh（Tupaia belangeri）的纹状皮质（V1）的产后发育。

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Histological serial sections, three-dimensional reconstructions and morphometry served to study the postnatal development of V1 in tree shrews. The main objectives were to evaluate the expansion of V1, the implications of its growth on the occipital cortex and, vice versa, the effects of the expanding neocortex on the topography of V1. The future V1 was identified on postnatal day 1 by its granular layer IV, covering the superior surface of the occipital cortices including the poles. A subdivision of layer IV, distinctive for the binocular part, was evident in the central region. V1 expanded continuously with age into all directions succeeded by the maturation of layering. The monocular part was recognized from day 15 onward, after the binocular part had reached its medial border. In reference to the retinotopic map of V1, regions emerged in a coherent temporo-spatial sequence delineating the retinal topography in a central to peripheral gradient beginning with the visual streak representation. The growth of V1 was greatest until tree shrews open their eyes, culminated during adolescence, and completed after a subsequent decrease in the young adult. Simultaneous expansion of the neocortex induced a shifting of V1. Translation and elongation of V1 entailed that the occipital cortex covered the superior colliculi along with a downward rotation of the poles. The enlargement of the occipital part of the hemispheres was in addition associated with the formation of a small occipital horn in the lateral ventricles, indicating an incipient 'true' occipital lobe harbouring mainly cortices involved in visual functions.
机译：组织学系列切片，三维重建和形态计量学研究了树sh中V1的产后发育。主要目标是评估V1的扩张，其增长对枕叶皮质的影响，反之亦然，评估新皮质的扩张对V1地形的影响。未来的V1在出生后的第1天由其颗粒层IV识别，覆盖了枕骨皮质的上表面，包括两极。在中央区域，可以明显看到双眼部分特有的第四层细分。随着分层的成熟，V1随着年龄的增长不断向各个方向扩展。在双眼部分到达其内侧边界之后，从第15天起识别出单眼部分。参考V1的视网膜位图，以连贯的时空序列出现区域，从视觉条纹表示开始，以中央到外围的梯度描绘视网膜的地形。 V1的生长最大，直到树sh睁开眼睛，在青春期达到顶峰，并在随后的成年幼虫减少后才完成。新皮层的同时扩张引起V1的移位。 V1的平移和伸长意味着枕骨皮层覆盖了上丘骨，同时极点向下旋转。另外，半球的枕骨部分的扩大还与在侧脑室中形成小的枕骨角有关，这表明初期的“真实”枕叶具有主要涉及视觉功能的皮层。

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