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Differentiation of the Segmented Tubular Nephron and Excretory Duct During Lamprey Metamorphosis by John H. Youson is a Neuroscience article available to read on EtoBox.

What is Differentiation of the Segmented Tubular Nephron and Excretory Duct During Lamprey Metamorphosis about?

The tubular portion of the adult lamprey nephron differentiates into various morphologically distinct segments during the seven stages of metamorphosis. At stage 1, a rudimentary nephron unit (RNU) originates from a nephrogenic mass attached to the peritoneum and elongates to become associated at its distal end with the archinephric (excretory) duct. The rapidly dividing cells show little sign of differentiation. Separation of the RNU from the peritoneum in stage 2 is first accompanied by widening of lateral intercellular spaces and then eventually by the formation of a small lumen at the proximal end. Cells surrounding a portion of this lumen show early signs of ciliogenesis and hence are located in the position of the presumptive neck segment. The distal end of the stage 2 RNU contains an electron-dense material in an enlarged intercellular space and the cells make non-junctional contact with the archinephric duct. The larval cells of the latter structure are either lost during degeneration and desquamation or are transformed into adult cells. By the end of stage 3 replication of basal bodies and formation of cilia has resulted in the appearance of a ciliated neck segment while n

Who reads Differentiation of the Segmented Tubular Nephron and Excretory Duct During Lamprey Metamorphosis?

Author

John H. Youson

Publisher

Springer; Springer-Verlag; Springer Verlag; J.F. Bergmann; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0340-2061)

Published

1983

Language

EN

Field

Neuroscience (Life Sciences)