Wilson P M, Astheimer L B
Anatomy Department, University of Tasmania, Hobart, Australia.
Brain Res. 1989 May 8;486(2):236-60. doi: 10.1016/0006-8993(89)90510-6.
Acetylcholinesterase (AChE) distribution in the dorsal lateral geniculate nucleus (LGd) of 3 polyprotodont and 3 diprotodont marsupials has been compared with the cytoarchitecture and, as appropriate, with retinal terminal bands (RTBs) as demonstrated by tracers injected into the vitreous body. In this series those polyprotodont marsupials showing only partial segregation of retinal input (Virginia opossum and Tasmanian devil), display the least cell laminar differentiation. In them AChE staining is mainly diffuse but stronger in areas of greatest retinal terminal overlap. Segregation of visual input increases progressively in the remaining polyprotodont (eastern quoll) and in the diprotodonts (Tasmanian bettong, Tasmanian potoroo and brush-tailed possum), culminating in the last-named, in which segregation is most complete. Related to this development varying numbers of cell laminae/sublaminae appear and retinal terminal laminae/sublaminae (bands) are revealed. AChE activity can be correlated with both specific cell laminae/sublaminae and retinal terminal laminae/sublaminae in these complex LGds. Greatest AChE staining in every case is related to laminae/RTBs located in the medial part of the lateral (alpha) segment of LGd. Cytoarchitecturally, the ventral lateral geniculate nucleus (LGv), unlike the heterogeneous LGd, is remarkably homogeneous in the series of animals studied and shows well-stained AChE patches relating to areas receiving significant retinal input.
已将3种多门齿有袋动物和3种双门齿有袋动物背外侧膝状核（LGd）中的乙酰胆碱酯酶（AChE）分布与细胞结构进行了比较，并在适当情况下与通过注入玻璃体的示踪剂所显示的视网膜终末带（RTB）进行了比较。在这一系列动物中，那些仅显示视网膜输入部分分离的多门齿有袋动物（弗吉尼亚负鼠和袋獾），其细胞层分化程度最低。在它们当中，AChE染色主要呈弥漫性，但在视网膜终末重叠最多的区域更强。视觉输入的分离在其余的多门齿有袋动物（东部袋鼬）和双门齿有袋动物（袋狸、长鼻袋狸和帚尾袋貂）中逐渐增加，在最后一种动物中达到顶峰，其分离最为完全。与此发育过程相关，出现了数量不等的细胞层/亚层，并揭示了视网膜终末层/亚层（带）。在这些复杂的LGd中，AChE活性可与特定的细胞层/亚层以及视网膜终末层/亚层相关联。在每种情况下，最大的AChE染色都与位于LGd外侧（α）段内侧部分的层/RTB相关。在细胞结构上，腹外侧膝状核（LGv）与异质性的LGd不同，在所研究的动物系列中非常均匀，并且显示出与接受大量视网膜输入的区域相关的染色良好的AChE斑块。
