摘要
应用 HRP 逆行追踪技术,通过在发声肌注射 HRP,对无尾两栖类蛙和蟾蜍延脑内发声核团进行定位比较。结果表明。(1)三种动物延脑内支配发声肌运动的核团均为舌咽—迷走运动核(nIx-x);(2)无尾两栖类中同种动物的雌雄之间nIx-x 的发达程度不同,雄性较雌性发达一些;同科动物相比,nIx-x 的形状及发达程度相近,不同科动物之间则存在差异,蛙科较蟾蜍科发达一些;(3)支配发声肌的感觉神经可能在脑内没有直接投射。
Retrograde transport of horseradish peroxidase(HRP)was used to locate vocal nucleus in medulla. The experimental results indicated that the motor nucleus of hypoph- aryngeal-vagus cranial nerves(nⅨ-Ⅹ)in medulla contros the movement of vocal muscle of all animals studied.The developed degrees of nIx-x are different between male and female in the same species of Amphibian.Male is more developed.The developed degrees of nⅨ-Ⅹ are similar in the families but different among the Rnfamilies.fanidaeis more developed than Bufonidae.Perhaps the sensory nerve innervating the vocal muscles doesn't directly project to medulla.
