Albano J E, Norton T T, Hall W C
Brain Res. 1979 Sep 7;173(1):1-11. doi: 10.1016/0006-8993(79)91090-4.
The laminar origin of the efferent projections from the superior colliculus to the pulvinar and to the dorsal and ventral lateral geniculate nuclei has been studied using the retrograde axonal transport of horseradish peroxidase. Following injections in either the dorsal or the ventral lateral geniculate nucleus, cells heavily labeled with the horseradish peroxidase reaction product are restricted primarily to the upper stratum griseum superficiale. These cells have small, fusiform somas with dendrites which extend dorsally and ventrally, perpendicular to the pial surface. In contrast, following injections in the pulvinar, cells labeled with reaction product are restricted primarily to the lower stratum griseum superficiale and to the most superficial part of stratum opticum. These cells typically have larger somas than cells in the upper stratum griseum superficiale, and often have dendrites which emerge horizontally from the cell body. When taken together with previous electrophysiological and anatomical studies, the present findings suggest that there is a laminar subdivision of the tree shrew stratum griseum superficiale, and that these subdivisions project selectively to different thalamic targets.
利用辣根过氧化物酶的逆行轴突运输，对从视丘上核到丘脑枕以及背侧和腹侧外侧膝状核的传出投射的层状起源进行了研究。在背侧或腹侧外侧膝状核注射后，被辣根过氧化物酶反应产物大量标记的细胞主要局限于上灰质浅层。这些细胞具有小的梭形胞体，其树突向背侧和腹侧延伸，垂直于软脑膜表面。相比之下，在丘脑枕注射后，被反应产物标记的细胞主要局限于下灰质浅层和视层的最表层。这些细胞的胞体通常比上灰质浅层的细胞大，并且其树突常常从细胞体水平发出。结合先前的电生理和解剖学研究，目前的研究结果表明，树鼩的上灰质浅层存在层状细分，并且这些细分选择性地投射到不同的丘脑靶点。
