NDLI: Functional connections between the tegmentum mesencephali and supraoptico-hypophyseal hypothalamic neurosecretory system in albino rats

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Functional connections between the tegmentum mesencephali and supraoptico-hypophyseal hypothalamic neurosecretory system in albino rats

Content Provider	Semantic Scholar
Author	Popovichenko, N. V. Chebotareva, L. L. Pivnenko, G. M. Pelevin, Yu. M.
Copyright Year	2005
Abstract	Bilateral electrolytic destruction of the paramedian zones of the caudal part of the tegmentum mesencephali caused an increase in the number of neurosecretory cells with low functional activity and the appearance of degenerating forms in the supraoptic nucleus of the hypothalamus (mainly in the medial part of the nucleus, adjacent to the optic chiasma); destruction of individual Herring's bodies was observed in the posterior lobe of the pituitary. The subnormal content of neurosecretory substance in all parts of the supraoptico-hypophyseal neurosecretory system was matched by a low plasma level of vasopressin-antidiuretic hormone. In animals with destructive lesions in the tegmentum mesencephali exposure to nociceptive stimulation activated mainly the neurosecretory cells in the lateral part of the supraoptic nucleus; the loss of neurosecretion from the posterior pituitary was partial; the plasma neurohormone level was much lower than in the control animals after nociceptive stimulation. It is postulated that changes in the response of the supraoptico-hypophyseal system to stress were probably the result of interruption of afferent pathways to the hypothalamus from the tegmentum mesencephali. The result of these experiments suggest that the paramedian zones of the tectum mesencephali exert a modulating influence on the function of this system during stress.
Starting Page	118
Ending Page	125
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1007/BF01062400
Volume Number	9
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1007/BF01062400
Journal	Neurophysiology
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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