Search results
Results from the WOW.Com Content Network
During follicular development, primordial follicles undergo a series of critical changes in character, both histologically and hormonally. First they change into primary follicles and later into secondary follicles. The follicles then transition to tertiary, or antral, follicles. At this stage in development, they become dependent on hormones ...
The follicular phase, also known as the preovulatory phase or proliferative phase, [1] is the phase of the estrous cycle (or, in primates [2] for example, the menstrual cycle) during which follicles in the ovary mature from primary follicle to a fully mature graafian follicle.
The primary follicle takes four months to become a preantral, two months to become antral, and then passes to a mature (Graaf) follicle. The primary follicle has oocyte-lining cells that go from floor to cubic and begin to proliferate, increasing the metabolic activity of the oocyte and follicular cells, which release glycoproteins and ...
As a follicle grows in size and the antrum develops, more layers of cumulus oophorus cells accumulate around the oocyte to aid in the acrosome reaction and sperm penetration into the oocyte. The proximity between the cumulus oophorus cells and the oocyte favors bidirectional communication, which is vital for oocyte development.
The labels in the folliculogenesis diagram (Folliclesinovary.jpg) are incorrect - they have been reversed. The arrow is pointing in the wrong direction "Corpus albicans" should be "Primary follicle" "Mature corpus luteum" should be "Secondary follicle" "Corpus luteum" should be "Graafian follicle" or "Mature vesicular follicle" etc.
The zona pellucida is a translucent matrix of cross-linked glycoprotein filaments that surrounds the mammalian oocyte and is 6.5–20 μm thick depending on the species. Its formation, which depends on a conserved zona pellucida-like (ZP) module that mediates the polymerization of egg coat components, [2] is critical to successful fertilization. [3]
Eventually, the oogonia will either degenerate or further differentiate into primary oocytes through asymmetric division. Asymmetric division is a process of mitosis in which one oogonium divides unequally to produce one daughter cell that will eventually become an oocyte through the process of oogenesis , and one daughter cell that is an ...
Sex organs constitute the primary sex characteristics of an organism. Sex organs are responsible for producing and transporting gametes, as well as facilitating fertilization and supporting the development and birth of offspring. Sex organs are found in many species of animals and plants, with their features varying depending on the species.