[Thymic Kurloff inclusion. Action on the ovogenesis of the rat]

Grafts and injections of cellular extracts from thymus and spleen of guinea pigs, were carried out in puberal and impuberal female rats. These organs are especially rich in Foa-Kurloff cells after oestrogentherapy. Kidney served as a reference material for the same experimental conditions. Controls received cellular injections and grafts from guinea pig organs without treatment. In all cases, ovarian histological and biometric study of recipient animals shows no alteration of the ovarian cycle. On the other hand, grafts and injections of cellular extracts from organs with high concentration of Foa-Kurloff cells induced hyperactivity of internal theca folliculi and of ovarian interstitial cells, only in puberal female rats.