Fujisawa H, Watanabe K, Tani N, Ibata Y
Brain Res. 1981 Feb 9;206(1):9-20. doi: 10.1016/0006-8993(81)90096-2.
The possibility that pathways of retinal fibers within the optic tract and the tectum of the adult newt are retinotopic was examined by selective labeling of the retinal fibers with horseradish peroxidase. Within the optic tract fibers from the ventral, temporal and dorsal retinal quadrants were ordered from the dorsal to ventral edges of th optic tract. The nasal retinal fibers exhibited two different pathways. The fibers from the dorsonasal retina ran along the ventral edge of the optic tract, while the fibers from the ventronasal retina ran along the dorsal edge of the optic tract. Segregation of pathways within the optic tract was incomplete between the nasal and other retinal fibers. The dorsonasal retinal fibers were mixed completely with the dorsal retinal fibers, and the ventronasal retinal fibers were mixed partly with the ventral retinal fibers. Both the dorsal and dorsonasal retinal fibers preferentially entered the lateral tract, and finally projected onto the ventrolateral parts of the middle tectum and of the caudal tectum, respectively. The ventral and ventronasal retinal fibers entered the dorsomedial tract, and projected onto the dorsomedial parts of the middle tectum and of the caudal tectum, respectively. The temporal retinal fibers invaded the nasal tectum directly. Most dorsal, ventral, and nasal retinal fibers ran along the sub-tracts as far as to the level of their terminals, then sharply turned in a direction to the tectum.
通过用辣根过氧化物酶选择性标记视网膜纤维，研究了成年蝾螈视束和顶盖内视网膜纤维通路是否具有视网膜拓扑结构。在视束内，来自视网膜腹侧、颞侧和背侧象限的纤维从视束的背侧边缘向腹侧边缘有序排列。鼻侧视网膜纤维表现出两种不同的通路。来自鼻背侧视网膜的纤维沿着视束的腹侧边缘走行，而来自鼻腹侧视网膜的纤维沿着视束的背侧边缘走行。鼻侧视网膜纤维与其他视网膜纤维在视束内的通路分离并不完全。鼻背侧视网膜纤维与背侧视网膜纤维完全混合，鼻腹侧视网膜纤维与腹侧视网膜纤维部分混合。背侧和鼻背侧视网膜纤维均优先进入外侧束，最终分别投射到中脑顶盖和尾侧顶盖的腹外侧部分。腹侧和鼻腹侧视网膜纤维进入背内侧束，并分别投射到中脑顶盖和尾侧顶盖的背内侧部分。颞侧视网膜纤维直接侵入鼻侧顶盖。大多数背侧、腹侧和鼻侧视网膜纤维沿着子束一直延伸到其终末水平，然后急剧转向顶盖方向。
