Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel
1. 1. Single injections of 15 μl of 1 M NaCl or 2 M sucrose into the carotid system of normal unanesthetized toads induced a rapid and significant decrease of urine production. 2. 2. This appears to be the first report on the existence of a Verney-like phenomena in a non-mammalian vertebrate. This a...
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1987
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009629_v87_n1_p107_Segura http://hdl.handle.net/20.500.12110/paper_03009629_v87_n1_p107_Segura |
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paper:paper_03009629_v87_n1_p107_Segura |
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paper:paper_03009629_v87_n1_p107_Segura2023-06-08T15:27:46Z Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel sodium chloride sucrose animal article brain diencephalon diuresis drug effect electrolyte balance hypophysectomy male osmolarity physiology toad Animal Brain Bufo arenarum Diencephalon Diuresis Hypophysectomy Male Osmolar Concentration Sodium Chloride Sucrose Support, Non-U.S. Gov't Water-Electrolyte Balance 1. 1. Single injections of 15 μl of 1 M NaCl or 2 M sucrose into the carotid system of normal unanesthetized toads induced a rapid and significant decrease of urine production. 2. 2. This appears to be the first report on the existence of a Verney-like phenomena in a non-mammalian vertebrate. This antidiuresis was blocked out in the hypophysectomized diencephalic lesioned animal. 3. 3. Concurrently, small volumes (4 μl) of 1 M NaCl but not 2 M sucrose also induced antidiuresis when injected into the midbrain tegmentum of normal but not of hypophysectomized diencephalic lesioned toads. 4. 4. Larger volumes (6μl) of 2 M sucrose were needed to induce a similar antidiuresis in normals. 5. 5. Furthermore, even larger volumes (more than 8 μl) of any of both solutions were able to induce oliguria in normal as well as in hypophysectomized toads. 6. 6. On the basis of these results, the following conclusion would be drawn: (a) the brain of the toad is able to detect ionic and osmotic stimuli, (b) these stimuli apparently affect different receptors in the brain, (c) the antidiuresis initiated by these mechanisms is dependent on diencephalic integrity. © 1987. 1987 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009629_v87_n1_p107_Segura http://hdl.handle.net/20.500.12110/paper_03009629_v87_n1_p107_Segura |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
sodium chloride sucrose animal article brain diencephalon diuresis drug effect electrolyte balance hypophysectomy male osmolarity physiology toad Animal Brain Bufo arenarum Diencephalon Diuresis Hypophysectomy Male Osmolar Concentration Sodium Chloride Sucrose Support, Non-U.S. Gov't Water-Electrolyte Balance |
| spellingShingle |
sodium chloride sucrose animal article brain diencephalon diuresis drug effect electrolyte balance hypophysectomy male osmolarity physiology toad Animal Brain Bufo arenarum Diencephalon Diuresis Hypophysectomy Male Osmolar Concentration Sodium Chloride Sucrose Support, Non-U.S. Gov't Water-Electrolyte Balance Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| topic_facet |
sodium chloride sucrose animal article brain diencephalon diuresis drug effect electrolyte balance hypophysectomy male osmolarity physiology toad Animal Brain Bufo arenarum Diencephalon Diuresis Hypophysectomy Male Osmolar Concentration Sodium Chloride Sucrose Support, Non-U.S. Gov't Water-Electrolyte Balance |
| description |
1. 1. Single injections of 15 μl of 1 M NaCl or 2 M sucrose into the carotid system of normal unanesthetized toads induced a rapid and significant decrease of urine production. 2. 2. This appears to be the first report on the existence of a Verney-like phenomena in a non-mammalian vertebrate. This antidiuresis was blocked out in the hypophysectomized diencephalic lesioned animal. 3. 3. Concurrently, small volumes (4 μl) of 1 M NaCl but not 2 M sucrose also induced antidiuresis when injected into the midbrain tegmentum of normal but not of hypophysectomized diencephalic lesioned toads. 4. 4. Larger volumes (6μl) of 2 M sucrose were needed to induce a similar antidiuresis in normals. 5. 5. Furthermore, even larger volumes (more than 8 μl) of any of both solutions were able to induce oliguria in normal as well as in hypophysectomized toads. 6. 6. On the basis of these results, the following conclusion would be drawn: (a) the brain of the toad is able to detect ionic and osmotic stimuli, (b) these stimuli apparently affect different receptors in the brain, (c) the antidiuresis initiated by these mechanisms is dependent on diencephalic integrity. © 1987. |
| title |
Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| title_short |
Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| title_full |
Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| title_fullStr |
Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| title_full_unstemmed |
Antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, Bufo arenarum hensel |
| title_sort |
antidiuretic responses to osmotic, ionic or volume stimulation of the brain in the unanesthetized toad, bufo arenarum hensel |
| publishDate |
1987 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03009629_v87_n1_p107_Segura http://hdl.handle.net/20.500.12110/paper_03009629_v87_n1_p107_Segura |
| _version_ |
1768542788530470912 |