马卡克的中层外层皮质直接皮质原生细胞反的并行流.
Matthew Adusei1, Edward M Callaway2, W Martin Usrey3,4,5
1Neuroscience Graduate Program, University of Rochester, Rochester, New York 14642.
eNeuro
|March 13, 2024
概括
研究人员在灵长类动物中发现了从视觉皮层到 thalamus 的新反途径. 这挑战了将背侧生殖细胞核 (LGN) 视为简单的感官中继器的观点,这表明它在视觉处理中起着更复杂的作用.
科学领域:
- 神经科学是一个神经科学.
- 灵长类的视觉系统
- 甲状腺皮层电路的电路.
背景情况:
- 第一阶的乳头核,就像背侧生殖细胞核 (LGN) 一样,将感觉信息传递给皮质.
- 从皮质到 thalamus 建立了互惠的反,主要假定来自主要的感官皮质.
- 外层视觉皮层在为LGN提供直接反方面的作用仍然在很大程度上未被描述.
研究的目的:
- 调查灵长类大脑中层次外层视觉区域中皮质原生神经元的存在和特征.
- 为了确定外层视觉区域是否提供直接反投射到背侧生殖细胞核 (LGN).
- 探索这些外层皮质原蛋白神经元的形态多样性及其对视觉处理流的潜在影响.
主要方法:
- 在 Macaca mulatta (灵长类动物) 的大脑中利用病毒介导电路跟踪.
- 对已识别的皮质原蛋白神经元进行了定量形态分析.
- 在外层视觉区域检查的神经元群体,包括MT,MST和V4.
主要成果:
- 在多个中级外层视觉区域 (MT,MST,V4) 确定了皮质原蛋白神经元.
- 在这些外层皮质原蛋白神经元中发现了形态多样性,在不同区域分布不同.
- 在许多外层皮质造生神经元中观察到棘状星状形态,可能准 koniocellular LGN 层.
结论:
- 外层视觉皮层区域为背侧生殖细胞核 (LGN) 提供直接反,挑战了传统的看法,认为LGN是一种简单的继电器.
- 多种形态类型的存在表明,在多个视觉处理阶段,并行V1绕过反流.
- 这些发现需要重新评估LGN作为视觉信息处理动态中心的作用.
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