NEUROENDOCRINE MECHANISM OF COLOR CHANGE IN BUFO ARENARUM HENSEL

Abstract
A technique to test the melanotrophic action of blood is studied. Light produces pallor of the toad by inhibiting the secretion of melanotrophic hormone and by increasing that of the adrenals; the eyes are the most important receptors of the color regulating stimuli. The lobus infun-dibularis inhibits the secretion of melanotrophic hormone and stimulates the secretion of adrenaline. The peripheral nerves concentrate the pigment of melanophores but their importance is small; in the regulation of color, humoral factors are predominant.

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