Abstract
AbstractJuvenile lizards (Eumeces obsoletus) treated with FSH exhibited germ cell proliferation. However, only the first stages of oogenesis or spermatogenesis were elicited. No difference in spermatogenic stage was observed between treatment groups. Vitellogenesis was not observed in treated females although the primary (largest) follicles exhibited a granulosa composed of a single cell type indicative of a follicle just prior to yolking. In addition to gonadal effects, accessory structures which are steroid dependent exhibited changes. Oviductal weight increased significantly with FSH treatment. Histological examination revealed that both oviductal glands and oviductal epithelium increased in size as did epididymal cell heights in males. These structures are steroid dependent in adults. These data suggest that juvenile gonads respond to gonadotropin although not in a typical adult manner. Sexual maturation is not only dependent on gonadal responsiveness but on the maturation of the hypothalamohypophysial axis and thus, on gonadotropin secretion as well. In addition, a critical amount of lipid storage may be required for vitellogenesis and gonadal function.
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