A comparative study on the secretory activity of the subcommissural organ in the European green frogs: Rana esculenta, rana lessonae and Rana ridibunda
1. 1. The subcommissural organ (SCO), present in all vertebrates, is situated in the roof of the third brain ventricle, and secretes into this ventricle a glycoproteinaceous, fibre-like structure, the liquor fibe (LF). 2. 2. The three forms of European green frogs diner from each other in the three...
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Published in | Comparative biochemistry and physiology. A, Comparative physiology Vol. 66; no. 4; pp. 593 - 597 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
1980
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Online Access | Get full text |
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Summary: | 1.
1. The subcommissural organ (SCO), present in all vertebrates, is situated in the roof of the third brain ventricle, and secretes into this ventricle a glycoproteinaceous, fibre-like structure, the liquor fibe (LF).
2.
2. The three forms of European green frogs diner from each other in the three parameters used to measure the secretory activity of the SCO: the amounts within the SCO of stained secretory material and of secretory material labelled by a radioactive precursor, and the growth rate of LF.
3.
3. The observed differences indicate that the secretory activity of the SCO is distinctly higher in
Rana ridibunda than in
Rana lessonae, whereas in
Rana esculenta this activity is intermediate.
4.
4. These findings confirm the hybrid character of
esculenta, which is in many morphological, physiological and ecological features intermediate between
lessonae and
ridibunda. |
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ISSN: | 0300-9629 |
DOI: | 10.1016/0300-9629(80)90004-3 |