CROSSED AND UNCROSSED VISUAL TOPOGRAPHY IN DORSAL LATERAL GENICULATE-NUCLEUS OF THE PIGMENTED RAT
CROSSED AND UNCROSSED VISUAL TOPOGRAPHY IN DORSAL LATERAL GENICULATE-NUCLEUS OF THE PIGMENTED RAT
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DOI：
10.1152/jn.1983.49.4.877
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发表时间：
1983-01-01
影响因子：
2.5
通讯作者：
JEFFERY, G
中科院分区：
文献类型：
--
作者：
REESE, BE;JEFFERY, G
通过记录麻醉有色大鼠的多细胞反应，对背外侧膝状体（dLGN）内视网膜中心视野的代表性进行了电生理学评估。单独的实验检查的代表性，通过对侧或同侧的眼睛沿着背腹侧，中间和rostrocaudal尺寸的核。交叉投影显示视野的有序表示，将偏心率映射到100 °。从视神经盘。明显不存在> 60 °的偏心率。代表上鼻视觉空间。非交叉投影也显示了视野的有序表示，但在50 - 90 °的远偏心率下，其范围限于上鼻视觉空间。代表远偏心上鼻视空间的同侧投影在对侧表示中占据了与偏心度减小时的上鼻视空间相对应的区域。这两个区域被认为是双眼共轭的：每只眼睛的颞新月体与另一个新月体（共轭中央新月体）位于视盘和对侧眼睛的颞新月体之间。交叉和非交叉的代表可能是对齐的dLGN，使投影线的离散区域的双眼视野课程通过核从rostroventral尾背。虽然大鼠的dLGN缺乏cytoarchitecturally不同的板层与区域的传入输入从每只眼睛，如在灵长类动物和猫的dLGN，并列的组织原则表示的视野通过每只眼睛是相似的。
The representation of the retinocentric visual field within the dorsal lateral geniculate nucleus (dLGN) was assessed electrophysiologically by recording multicellular responses from anesthetized pigmented rats. Separate experiments examined the representation through either the contralateral or ipsilateral eye along the dorsoventral, mediolateral and rostrocaudal dimensions of the nucleus. The crossed projection displays an orderly representation of the visual field, mapping eccentricities out to 100.degree. from the optic disc. There is a marked absence of eccentricities > 60.degree. representing upper nasal visual space. The uncrossed projection also displays an orderly representation of the visual field but is limited in extent to upper nasal visual space at far eccentricities of 50-90.degree.. The ipsilateral projection, which represents far eccentric upper nasal visual space, occupies a region in the contralateral representation corresponding with upper nasal visual space at reduced eccentricity. It is these 2 regions that are considered binocularly conjugate: the temporal crescent of each eye with another crescent (the conjugate central crescent) lying between the optic disc and the temporal crescent of the opposite eye. The crossed and uncrossed representations are probably aligned in the dLGN so that projection lines for discrete regions of the binocular visual field course through the nucleus from rostroventral to caudodorsal. Although the dLGN of the rat lacks the cytoarchitecturally distinct laminae associated with the regions of afferent input from each eye, as is seen in the primate and cat dLGN, the organizing principle of apposing the representation of the visual field through each eye is similar.