Steedman J G, Stirling R V, Gaze R M
J Embryol Exp Morphol. 1979 Apr;50:199-215.
A cobalt chloride impregnation technique was applied to the optic nerve in Xenopus tadpoles and the central optic pathways were examined in cleared, whole-mounted preparations, and in thick sections. The overall plan of the optic input was visualized in relation to the outlines of the parts of the brain and details of the structure of the tectal optic neuropil, the neuropil of Bellonci and the basal optic neuropil were seen. The fibres in the main retinotectal tract maintained an orderly disposition with respect to each other, in contrast to the fibres of the basal optic tract, in which no order was apparent. Optic fibres were seen passing caudally from the region of the basal optic neuropil.
将氯化钴浸渍技术应用于非洲爪蟾蝌蚪的视神经，并在透明的整体标本和厚切片中检查中枢视觉通路。观察到视觉输入的总体布局与脑各部分的轮廓相关，还能看到顶盖视觉神经毡、贝隆奇神经毡和基底视觉神经毡的结构细节。与基底视束的纤维不同，主视顶盖束中的纤维相互之间保持有序排列，而基底视束的纤维中没有明显的顺序。可见视神经纤维从基底视觉神经毡区域向尾侧延伸。
