Makino-Tasaka M, Suzuke T, Nagai K, Miyata S
Exp Eye Res. 1985 Jun;40(6):767-78. doi: 10.1016/0014-4835(85)90122-8.
Visual pigments and a neurotransmitter, dopamine, were quantitatively investigated in the retina of adult bullfrog, Rana catesbeiana. The adult bullfrog (body length 15-16 cm, body weight 375 +/- 52 g, n = 10) had 21.4 +/- 4.2 nmol visual pigment and 209 +/- 28 pmol dopamine in retinal areas of 266 +/- 27 mm2. Greater pigment densities were recorded in a semicircular band around the optic disc, extending to the nasal and temporal peripheries of the ventral retina. The area with the highest concentration of visual pigment was found in the middle of the dorsal retina, 3-4 mm dorsal to the optic disc. A high concentration of vitamin A2-based pigment was found in the dorsal quarter of the retina (porphyropsin zone); the zone extended up to the most ventral part along peripheral regions of the retina. There was also a band with higher dopamine concentrations although it was not so prominent as that of the visual pigment; the highest concentration of dopamine was found in the area immediately dorsotemporal to the optic disc. Fluorescence micrography indicated that the distribution pattern of catecholamine-containing amacrine cells paralleled that of the dopamine content. The topographic map of dopamine was slightly different from that of visual pigment in the bullfrog retina.
对成年牛蛙（牛蛙）视网膜中的视觉色素和一种神经递质多巴胺进行了定量研究。成年牛蛙（体长15 - 16厘米，体重375±52克，n = 10）在266±27平方毫米的视网膜区域中含有21.4±4.2纳摩尔视觉色素和209±28皮摩尔多巴胺。在视盘周围的半圆形带中记录到更高的色素密度，该带延伸至腹侧视网膜的鼻侧和颞侧周边。视觉色素浓度最高的区域位于背侧视网膜中部，视盘上方3 - 4毫米处。在视网膜的背侧四分之一区域（视紫质区）发现了高浓度的基于维生素A2的色素；该区域沿着视网膜周边延伸至最腹侧部分。也有一条多巴胺浓度较高的带，尽管不如视觉色素的带那么明显；多巴胺浓度最高的区域位于视盘背颞侧紧邻处。荧光显微镜检查表明，含儿茶酚胺无长突细胞的分布模式与多巴胺含量的分布模式平行。牛蛙视网膜中多巴胺的地形图与视觉色素的地形图略有不同。
