Cooper M L, Pettigrew J D
J Comp Neurol. 1979 Sep 15;187(2):285-311. doi: 10.1002/cne.901870204.
We have studied the naso-temporal division of the retinothalamic pathway of the cat by making large unilateral injections of horseradish peroxidase into the lateral geniculate nucleus. In confirmation of previous work, our retinal whole-mounts show a distinct vertical decussation line separating the contralaterally projecting nasal retina from the ipsilaterally projecting temporal retina. The ipsilateral decussation line is quite sharp, while the contralateral decussation is somewhat more diffuse, with numbers of large cells extending a few degrees into the temporal retina. However, in contrast to the results of optic tract section, our material (demonstrating the thalamic component only) does not reveal any significant population of contralaterally projecting small cells across most of the temporal retina. The previous observation of approximately 200 micrometer of naso-temporal overlap in the area centralis is confirmed here, and evidence is presented that this overlap may increase at eccentricities above the horizontal meridian. Taken together with previously published data, this demonstration of the vertical decussation line has allowed us to estimate the relative inclinations of the major meridians of the cat's eye.
我们通过向猫的外侧膝状体核内大量单侧注射辣根过氧化物酶，研究了猫视网膜丘脑通路的鼻颞侧划分。正如之前的研究结果所证实的那样，我们的视网膜整装标本显示出一条明显的垂直交叉线，将对侧投射的鼻侧视网膜与同侧投射的颞侧视网膜分隔开来。同侧交叉线相当清晰，而对侧交叉则略显弥散，有一些大细胞延伸到颞侧视网膜几度的范围内。然而，与视束切断的结果不同，我们的材料（仅显示丘脑部分）并未揭示在大多数颞侧视网膜上有任何显著的对侧投射小细胞群。此处证实了之前关于中央凹处鼻颞侧重叠约200微米的观察结果，并提供了证据表明这种重叠可能在水平子午线以上的偏心度处增加。结合之前发表的数据，这条垂直交叉线的证明使我们能够估计猫眼主要子午线的相对倾斜度。
