• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Advances in biomedical research >Differential retinal localisation of pathways for pattern and movement in rabbit vision.
【24h】

Differential retinal localisation of pathways for pattern and movement in rabbit vision.

机译：视网膜视觉模式和运动途径的视网膜差异定位。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The rabbit eye has 397,000 retinal ganglion cells compared with the cat that has 193,000. Despite this, pattern acuity in the rabbit is inferior, 4 Hz compared to 6 Hz in the cat. This is probably due to the smaller proportion of uncrossed fibres in the rabbit, which has only 39,700 uncrossed fibres to the cat's 77,200. The most conspicuous feature of the rabbit retina is the visual streak which extends along the horizontal azimuth from the nasal margin to the temporal limit of the retina, where there is an upward expansion. We believe the parallel portion of the streak processes movement detection; and that the temporal anakatabatic area (area centralis) is responsible for pattern perception.rnBoth anatomical and behavioural experiments were used to test this possibility. The visual capacity of both normal and chiasma rabbits were compared for differential sensitivity to either pattern or movement vision. The injection of HRP into the vitreal chamber of one eye of normal rabbits revealed extensive uptake throughout the contralateral thalamus. In the ipsilateral thalamus there was uptake solely from the ipsilateral retinal projection to a restricted wafer of the lateral geniculate nucleus (LGN). The same area on the contralateral side showed no HRP uptake. The chiasma cut rabbits showed a very different distribution of HRP in the thalamus. The uptake was restricted a thin wafer of the LGN, with no contralateral uptake. Thus the thalamic projections from the retinal area centralis were strictly segregated from the thalamic target areas for the visual streak without any overlap.rnComparing the visual capacity of the normal and chiasma sectioned rabbits revealed both to have the same visual acuity. Using OKN as a measure of movement detection, normal rabbits showed both a directional and velocity tuned response. The chiasma sectioned rabbits, with only uncrossed fibre projections remaining, showed a total loss of OKN, additionally the visual component of the VOR was also absent. Chiasma sectioned rabbits also showed a complete loss of conditioned NM responses.rnThese findings provide strong evidence for anatomically separate pathways for pattern and movement vision in the rabbit. In addition the movement pathways are necessary for occulomotor control of such reflexes as OKN, VOR and NM anticipatory responses.
机译：兔子的眼睛有397,000个视网膜神经节细胞，而猫的眼睛有193,000个。尽管如此，兔子的模式敏锐度却比猫的6 Hz低4 Hz。这可能是由于兔子中未交叉纤维的比例较小，兔子中只有39,700个未交叉纤维，而猫中只有77,200个。兔子视网膜最显着的特征是视觉条纹，该视觉条纹从鼻缘沿水平方位延伸到视网膜的颞极限，在此向上扩展。我们认为条纹的平行部分会进行运动检测；并且颞骨的抗代谢区（area centralis）负责模式感知。rn解剖和行为实验均用于检验这种可能性。比较正常兔和chi兔的视觉能力，以了解其对模式或运动视觉的不同敏感性。在正常兔子的一只眼睛的玻璃体腔内注射HRP时，整个对侧丘脑均吸收大量HRP。在同侧丘脑中，仅从同侧视网膜投影摄取到外侧膝状核（LGN）的受限晶片。对侧相同区域未显示HRP摄取。 as割的兔子在丘脑中显示出非常不同的HRP分布。摄取受限于LGN的薄晶圆，没有对侧摄取。因此，来自视网膜中央区域的丘脑投影与丘脑目标区域严格隔离，没有视觉重叠。rn比较正常和chi骨切片兔的视力，发现它们具有相同的视力。使用OKN作为运动检测的量度，正常兔子表现出方向性和速度调整性响应。恰恰切成薄片的兔子只剩下不交叉的纤维突起，显示出OKN完全丧失，此外，还没有VOR的视觉成分。 Chiasma切片的兔子也显示出条件性NM反应的完全丧失。这些发现为解剖上分离模式和运动视觉的途径提供了有力的证据。另外，运动路径对于诸如OKN，VOR和NM预期反应之类的反射的动眼控制是必需的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号