The development and morphology of Kupffer's vesicle in the plaice,Pleuronectes platessa(L.) and in the cod,Gadus morhuaL.

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Abstract
In the plaice, Pleuronectes platessa, Kupffer's vesicle develops at the posterior end of the embryo, near the closing blastopore. This position appears to be usual in teleost embryos. In the cod, Gadus morhua, however, the vesicle develops in the future liver region. In both species the vesicle is lined dorsally by entodermal columnar cells, whereas the ventral wall is made of periblast. In P. platessa Kupffer's vesicle atrophies after a secondary, ventral wall has been formed from the entoderm anterior to the vesicle. Both the hindgut and the postanal gut develop from this secondary, ventral wall. The cells of the dorsal wall of Kupffer's vesicle are in G. morhua incorporated in the epithelial lining of the future gut in the liver region. After the gut is closed ventrally, the vesicle is situated between the gut and the periblast. The vesicle atrophies as the periblast shrinks. In P. platessa and G. morhua, Kupffer's vesicle is regarded as representing a vestige of the archenteron.