Summary
The preoptical center of tadpoles and frogs was ablated, or nervous connections with the hypohysis were severed. Hyperpigmentation was not eliminated by homo- or heterografts of the hypothalamus, which stimulated metamorphosis. The melanophores of skin grafts of hypophysectomized amphibians were resistant to the hypothalamic neurosecretion, but sensitive to the extract of pars intermedia. Whereas the effect of the hypothalamus on the anterior lobe and on its thyreotropic function is humoral, the regulation of pigment reactions is effected via the nervous pathways, and is apparently produced by inhibition of the secretion of intermedin in the pars intermedia.
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Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 55, No. 2, pp. 100–104, February, 1963
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Voitkevich, A.A., Ovchinnikova, G.A. The nature of the regulatory influences exerted by the hypothalamus on the anterior lobe and pars intermedia of the hypophysis. Bull Exp Biol Med 55, 207–210 (1964). https://doi.org/10.1007/BF00798833
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DOI: https://doi.org/10.1007/BF00798833