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- W4246980963 abstract "Follicular atresia or degeneration is a widespread phenomenon in the ovaries of vertebrates including fish, amphibians, reptiles, birds and mammals (Guraya 1976b; Saidapur 1978). Follicular atresia is comparatively much more extensive in the ovaries of birds and mammals and this process may play an important role in limiting the number of eggs produced during each cycle (Guraya 1973a). In the previous books on the biology of ovarian follicles in fish and mammals, the present author (Guraya 1985, 1986a) has discussed the morphological, histochemical, biochemical and endocrinological characteristics of follicular atresia, which vary with the stage of follicle growth as well as with the ovarian cycle and species. Both intraovarian and extraovarian factors have been observed to influence follicular growth and atresia. Atretic follicles of some stages contribute thecal-type gland cells in the ovaries of fish and mammals, which have been shown to possess the ultrastructural, histochemical and biochemical features of steroid gland cells, and thus are steroid secretors. The causes and functions of follicular atresia have still to be determined more precisely. This chapter extends these discussions to follicular atresia in the ovaries of reptiles and birds, which produce large follicles. Such comparative studies of follicular atresia in different classes of Vertebrata may help us to a deeper insight into the causes and functional or physiological significance of follicular atresia, by which oocytes at various stages of their development are eliminated from the ovaries other than by ovulation." @default.
- W4246980963 created "2022-05-12" @default.
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- W4246980963 date "1989-01-01" @default.
- W4246980963 modified "2023-09-27" @default.
- W4246980963 title "Follicular Atresia" @default.
- W4246980963 doi "https://doi.org/10.1007/978-3-642-83628-2_10" @default.
- W4246980963 hasPublicationYear "1989" @default.
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