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Biol Bull 74: 349-363. (June 1938)
© 1938 Marine Biological Laboratory
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A SIMPLE TELEOST KIDNEY IN THE GENUS CYCLOTHONE

BRADFORD B. OWEN 1

1 From the Biological Laboratories, Harvard University

The Cyclothone kidney is extremely simple. The entire system consists of two tubules running a practically straight course side by side and uniting at the bladder. They are surrounded anteriorly by hemopoietic tissue and posteriorly by the organ of Stannius.

The tubules can be divided into the following histologically distinct portions: glomerular capsule; neck segment; proximal convolute, with two types of brush border epithelium; ciliated intermediate segment; and terminal segment. An abrupt change in cell type separates the neck segment and the two parts of the proximal convolute, but the intermediate segment arises after a long zone of slow transition, and the cells of the terminal segment also appear gradually.

The cell types of the different regions of the nephron are described, with a discussion of the problems of homologies between tubule segments of different kidneys.






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Copyright © 1938 by the Marine Biological Laboratory.