pronephric tubule

pro·neph·ric tu·bule

an excretory unit of the pronephros, present only in vestigial form in human embryos.

pronephric tubule

any of the segmentally arranged excretory units of the pronephros in the early developing vertebrate embryo. The tubules open into the pronephric duct and communicate with the coelom through a nephrostoma. In humans and the higher vertebrates, the tubules are present only in vestigial form; in lower animals they are functional.
References in periodicals archive ?
2+] signaling during the formation of the pronephros (the functional embryonic kidney) in both intact zebrafish and Xenopus laevis embryos, as well as in Xenopus animal caps that are isolated at the blastula stage and induced to differentiate into pronephric tubules by incubation with retinoic acid (RA) and activin A (AA).