part of develops from start stage end stage pronephric mesoderm pronephric duct Duct of the embryonic kidney, present bilaterally ventral to the somites and leading to the cloacal chamber. Wingert et al. have suggested that the pronephric duct as described traditionally may consist of subregions which are analogous to portions of the tubule segment of mammalian and other fish nephrons. TAO:0000150 pronephric ducts ZFA:0000150 zebrafish_anatomy pronephros duct segmentation:10-13 somites larval:days 7-13