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), depend 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 lady replica in mammals, or to postmenopausal interval in people. really, quite a few fertility and sterility difficulties on the ovarian point are on the topic of follicles. for this reason, a radical knowing of the biology of ovarian follicles in mammals is of basic curiosity to a wide selection of educational and medical disciplines. examine in their constitution, functionality, and keep watch over consists of mor phology, together with ultrastructure, phone 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 assorted 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. eventually, medical scientists, toxicologists and physicians need to know the conventional and pathological positive factors of ovarian follicles in ladies, specifically with regards to future health and the legislation of fertility. Having in view the nice significance of learning numerous elements of biology of ovarian follicles, various papers and reports on numerous elements of ovarian follicles are released each year in a large choice of medical journals.
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There are seen waves of production of micronucleoli - the early and the middle diplonema. From the morphological and cytochemical characteristics of main nucleoli and micronucleoli, a possible relationship between vacuolization of the nucleolus actively synthesizing RNA and the progressive lack of its granular component has been shown. Crozet et al. (1981) have also suggested that the fibrillo-granular and vacuolated nucleoli present at the onset of antrum formation in pig oocytes are associated with active RNA synthesis as determined by in vitro incorporation of [3H]-uridine.
Besides the Golgi complex, two other organelles have also been involved in the formation of cortical granules. Several multivesicular bodies and other vesicular complexes are also developed and increased in number corresponding to the hyperplasia of the Golgi complex (Adams and Hertig 1964, Sz6116si 1967). Dense cortical granule-like vesicles are also observed to lie deep within the maturing oocyte of the dog ovary and often are enclosed within the lamellar yolk space (Tesoriero 1981). Granules within this space undergo changes in size, matrix configuration, and vacuolization.
An ultracytochemical examination has revealed that these inclusions contain amino groups, indicating their protein nature. This suggestion is further supported by the fact that the so-called lamellar structures of the unfertilized rat egg ooplasm are ftIaments constituted of proteins (Baeckelan and Heinen 1980). No RNA is found in them, which indicates that they do not represent a particular organization of polyribosomes. These ftIaments are considered as protein reserves, possibly of membranous origin, for use during segmentation.