Biology of Ovarian Follicles in Mammals by Professor Sardul S. Guraya (auth.)

By Professor Sardul S. Guraya (auth.)

Both capabilities of the mammalian ovary, the endocrine and (synthesis and secretion of steroid hormones) and exocrine (production of ova), rely on the presence and cyclic development of follicles, because the depletion of primordial follicles from the ovary ends up in cessation of those f-unctions or woman replica in mammals, or to postmenopausal interval in people. truly, a variety of fertility and sterility difficulties on the ovarian point are concerning follicles. consequently, a radical knowing of the biology of ovarian follicles in mammals is of basic curiosity to a large choice of educational and medical disciplines. learn in their constitution, functionality, and keep watch over comprises mor­ phology, together with ultrastructure, telephone biology, body structure, endocrinology, biochemis­ try out, immunology, neurobiology and pharmacology. Zoologists take curiosity in comparative and evolutionary features of biology of ovarian follicles in lots of diverse teams of mammals. Agricultural scientists and natural world biologists want a thorough wisdom of the biology of follicles to manage extra successfully fecundity in family animals and endangered species of mammals. ultimately, medical scientists, toxicologists and physicians need to know the traditional and pathological gains of ovarian follicles in ladies, specially relating to overall healthiness and the law of fertility. Having in view the nice value of learning quite a few elements of biology of ovarian follicles, quite a few papers and stories on a number of features of ovarian follicles are released every year in a large choice of clinical journals.

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Eppig (1976) has made a study of mouse oogenesis in vitro with special reference to oocyte isolation and the utilization of exogenous energy source by growing oocytes. The utilization of exogenously administered [14C]-labelled energy sources by oocytes in various growth stages has been determined by measurement of evolved [14C0 2 ]. Little or no evolution of [14C0 2 ] is detected from oocytes of any size incubated in [14C]-glucose, lactate or succinate. The production of [14C0 2 ] from [14C]pyruvate is increased logarithmically when plotted against increase in oocyte volume, with a plateau occurring after the oocytes have reached a volume of 65,000 Ilm3 (50 Ilm diameter).

5 11m and are located beneath the plasma membrane or at some distance from it (Figs. 13 and 16). Because of their absence from fertilized eggs, they were considered to playa rather important role in the "zona reaction" (prevention of additional sperm penetration through the zona pellucida after the entry of the first) of the mammalian egg (Braden et al. 1954). Subsequent electron microscope studies on the cortical granules have clearly revealed that they form a general feature of unpenetrated mammalian eggs (Szollosi 1962, 1967, 1976, Hadek 1963a, b, 1965, 1969, Adams and Hertig 1964, Zamboni and Mastroianni 1966a, Zamboni et al.

17) (Weakley 1966, Zamboni and Mastroianni 1966b, Baca and Zamboni 1967, Sz6116si 1967, Norberg 1972), then the granules separate from the Golgi units and are shifted towards the surface to form small aggregations. The oocytes in pre-ovulatory follicles of bovines, hamster, humans, ovines, and rabbit show only a few cortical granules adjacent to the plasma membrane (Baca and Zamboni 1967, Sz6116si 1967, 1976, 1978, Fleming and Saacke 1972, Sz6116si et al. 1978). Instead, the cortical granules may form either aggregations or are scattered A.

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