Les hormones produites par les glandes neuroendocrines sont nombreuses. Nous reviendrons dessus plus loin. Il permet notamment de synchroniser le rythme veille-sommeil sur le rythme jour-nuit. Ils portent les noms de faisceau hypothalamico-tegmental et faisceau hypothalamico-spinal. Par exemple, l'hypothalamus produit de la thyrotropin-releasing hormone release , qui stimule la production de thyrotrophine par l'hypophyse. Ces capillaires se rejoignent au niveau de l'infundibulum pour former la veine hypophysaire portale, qui se subdivise encore en un lacis de vaisseau sanguins au contact de l'hypophyse.
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We'd like to understand how you use our websites in order to improve them. Register your interest. In the hypothalamus of albino rats submitted to positive air ions for 20 to 40 days, supra-optic and paraventricular nuclei exhibit various signs of hypo-activity: a slight decrease of nuclear and nucleolar volumes, an increase of the amount of neurosecretory granules in these neurones, while the migration of the neurosecretory material in the axons is diminished, almost no staining substance being detected along the axons.
Simultaneously, the chrome-haematoxylin positive material is greatly reduced in the neurohypophysis, mainly after 40 days. Considering these data and other results, either unpublished or previously reported by various authors, it appears that the hypo-activity observed in the hypothalamo-neurohypophysial system may be correlated with a hyposecretion of antidiuretic hormone ADH.
There is no increase of diuresis; instead, an antidiuresis was noted which tends to disappear after about two weeks of treatment. This finding suggests that the hypothalamo-hypophysial response observed may be due to a disturbance of water metabolism induced by another antidiuretic factor. Besides, it was established that a treatment with positive air ions induces a significant increase of the serotonin level of the blood Krueger. As an antidiuretic effect is directly exerted by serotonin on the kidneys, it may be responsible for the antidiuresis observed in this experiment.
The inhibition of hypothalamic nuclei according to histological criteria would represent a homeostatic response trying to compensate the antidiuresis initially produced by serotonin, the neurohypophysial storage of ADH delaying the efficiency of this hypothalamic inhibition.
All the available data on the modifications of water and electrolyte metabolism detected after a positive aero-ionization may be explained satisfactorily by an increase of the serotonin level of the blood, progressively counteracted by a decrease of ADH. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve.
Arman, van, C. Google Scholar. Barac, G. Paris , — Bargmann, W. Barry, J. Bourne, G. New York: Academic Press Casella, C. Collin, R. Erspamer, V. Nature Lond. Frey, A. Technical Information Series, Gen. Electric Comp. Garattini, S. Amsterdam: Elsevier Publ. Krueger, A. Nielsen, C. Olivereau, J. Paris , , — a. Paris , — b. Page, I. Lewis, editor. London: Pergamon Press Richter, C. Rinfret, A. Unpublished Rep. Sachs, H. Shoemaker, W. Worden, J. St Bonaventure Univ. Download references.
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Summary In the hypothalamus of albino rats submitted to positive air ions for 20 to 40 days, supra-optic and paraventricular nuclei exhibit various signs of hypo-activity: a slight decrease of nuclear and nucleolar volumes, an increase of the amount of neurosecretory granules in these neurones, while the migration of the neurosecretory material in the axons is diminished, almost no staining substance being detected along the axons.
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About this article Cite this article Olivereau, J.
Neurosciences/Le système nerveux endocrine
Le complexe hypothalamo-hypophysaire