Cat medial interlaminar nucleus: retinotopy, relation to tapetum and implications for scotopic vision.
Cat medial interlaminar nucleus: retinotopy, relation to tapetum and implications for scotopic vision.
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猫内侧层间核：视网膜位置、与绒毡层的关系以及对暗视觉的影响。
DOI：
10.1152/jn.1984.52.5.848
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发表时间：
1984
影响因子：
2.5
通讯作者：
Weyand,TG
中科院分区：
文献类型：
--
作者：
Lee,C;Malpeli,JG;Schwark,HD;Weyand,TG
对猫的内侧层间核（MIN）进行了足够详细的电生理定位，以分辨单个层，并在冠状面、矢状面和水平面上重建等方位和等仰角线。电生理学上定义的层流模式与同一动物解剖上显示的层流模式一致，也与解剖方法在几个未定位的细胞核中显示的一般模式一致。MIN由三个不同的层组成，每个层接收来自一个半视网膜的输入，但没有一个层代表整个半视网膜。我们证实了Guillery等人（19）的发现，即通过对侧和同侧眼睛分别在第1层和第2层表示对侧半场，而第3层通过对侧眼睛表示同侧半场。通过MIN连续表示高程和方位角绝对值。当等位线穿过第3层与第1层或第2层之间的边界时，方位角的绝对值保持不变，但方位角的符号发生变化。边界两侧的相邻点代表垂直子午线两侧镜像对称的视觉方向。这表明从垂直子午线的距离是膝状复合体内一个独立编码的参数。在MIN的任何层中几乎没有鼻颞部重叠。放大倍率（mm3 /立体面）与偏心率的相关功能与视网膜神经节细胞密度与偏心率的相关功能惊人地相似，这表明在所有偏心率处，视网膜神经节细胞的恒定比例投射到MIN。每个最小层的大部分体积用于较低的视野。对Sanderson（46）的膝状核视网膜定位图的分析显示，膝状核背外侧没有相应的低视野偏倚。MIN代表视网膜上与绒毡层大致重合的区域，提示MIN在昏暗视觉中起作用。
The medial interlaminar nucleus (MIN) of the cat was electrophysiologically mapped in sufficient detail to resolve individual laminae and to allow reconstruction of isoazimuth and isoelevation lines in coronal, sagittal, and horizontal planes. The electrophysiologically defined laminar pattern was in agreement with that revealed anatomically in the same animal, as well as with the general pattern revealed by anatomical methods in several unmapped nuclei. The MIN is made up of three distinct layers, each receiving inputs from one hemi-retina but none representing an entire hemifield. We confirm the findings of Guillery et al. (19) that the contralateral hemifield is represented in layers 1 and 2 through the contralateral and ipsilateral eyes, respectively, and that layer 3 represents the ipsilateral hemifield through the contralateral eye. Elevation and absolute value of azimuth are represented continuously through the MIN. When an isoazimuth line crosses the border between layer 3 and either layer 1 or 2, the absolute value of azimuth is maintained but the sign of the azimuth changes. Adjacent points on either side of this border represent mirror symmetrical visual directions on opposite sides of the vertical meridian. This indicates that the distance from the vertical meridian is an independently coded parameter within the geniculate complex. There is virtually no nasotemporal overlap in any layer of the MIN. The function relating magnification (mm3 per steradian) to eccentricity is strikingly similar to the function relating retinal ganglion cell density to eccentricity, suggesting that a constant fraction of retinal ganglion cells project to the MIN at all eccentricities. Most of the volume of each MIN layer is devoted to lower visual fields. Analysis of the geniculate retinotopic maps of Sanderson (46) reveals no equivalent bias toward lower visual fields in the dorsal lateral geniculate nucleus. The MIN represents a region of retina roughly coincident with the tapetum, suggesting a role of the MIN in dim-light vision.