Springer Online Journal Archives 1860-2000
Summary The cytology of the adenohypophysis of the male Japanese quail (Coturnix coturnix japonica) has been studied under a variety of experimental conditions: (1) treatment with long daily photoperiods for variable lengths of time; (2) the change from a long to a short daily photoperiod which induces gonadal regression; (3) castration followed by exposure to either short or long daily photoperiods, and (4) treatment with thyroxine, thiourea and metapirone. In parallel with the Cytological investigations, information on the level of hypophysial gonadotropins has been obtained by bioassay. The cytological investigations permit the recognition of seven types of cells in the adenohypophysis and the identification of gonadotropic cells, thyrotropic cells, and corticotropic cells. The significance of the orangeophilic alpha (STH ?) cells, and the erythrosinophilic eta (prolactin ?) cells remains hypothetical. A seventh cell type “kappa” is hypercyanophilic and positive with lead hematoxylin; it has been identified in other species of birds and may be a melanophorotropic cell. In castrates, an increase in pituitary gonadotropin appears only with photostimulation. It appears that photostimulation increases thyrotropic activity, an effect that is enhanced by castration.
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