The pronephros and the early development of the mesonephros in the duck.
The pronephros and the early development of the mesonephros in the duck.
复制标题
鸭的前肾和中肾的早期发育。
作者：
J. Davies
鸟类胚胎的外肾小球由Gasser（1879）、Balfour & Sedgwick（1878，1879）和Sedgwick（1880，1881）描述。塞奇威克描述了小鸡外部肾小球的详细发育过程，并表明它们通过一个短的过渡区与中肾的马尔皮基体在尾部连续。在这个水平上，可以看到外部和内部肾小球通过它们的血管核心彼此连续。Wiedersheim（1890）在Crocodilia和Chelonia中描述了一系列类似的外部和过渡肾小球，他认为这代表了从前肾到中肾的逐渐头尾过渡。几位作者（Sedgwick，1880; Mihalkovics，1885）指出，鸭的外肾小球比鸡的外肾小球发育得更好。据此，将鸭的早期排泄系统与鸡、鳄鱼、短吻鳄和龟的排泄系统进行了比较。
The external glomeruli of the avian embryo were described by Gasser (1879), Balfour & Sedgwick (1878, 1879) and Sedgwick (1880, 1881). Sedgwick described the detailed development of the external glomeruli in the chick and showed that they were continuous caudally with the Malpighian bodies of the mesonephros through a short transition zone. At this level, external and internal glomeruli were seen to be continuous with each other through their vascular cores. A similar series of external and transitional glomeruli was described by Wiedersheim (1890) in the Crocodilia and Chelonia, and was considered by him to represent a gradual craniocaudal transition from the pronephros to the mesonephros. The external glomeruli of the duck were stated by several authors (Sedgwick, 1880; Mihalkovics, 1885) to be better developed than in the chick. Accordingly, the early excretory system of the duck has been compared with that of the chick, crocodile, alligator and turtle.