What is ovarian Folliculogenesis?
Folliculogenesis is the developmental process of ovarian follicles starting from a reserve of quiescent primordial follicles set up in early life and ending with either ovulation or follicular death by atresia.
What is mean by fetal ovary?
When a female fetus develops fluid filled sacs on their ovaries that are more than 2cm in size, this is called a fetal ovarian cyst. How do fetal ovarian cysts happen? Fetal ovarian cysts happen because the fetus in the womb is exposed to pregnancy related hormones from the mother and the placenta.
What is the mammalian ovary?
The word “ovary” is derived from the Latin word “ovum,” meaning egg. The mammalian ovary is not only the female gonad, containing the supply of germ cells to produce the next generation, but also the female reproductive gland, controlling many aspects of female development and physiology.
What is the difference between oogenesis and folliculogenesis?
Follicles undergo meiosis in the fetal ovary. Oogonia get arrested at prophase I. The number of oocytes increase after puberty. Oogenesis involves unequal division of cells.
What is the process of folliculogenesis?
FOLLICULOGENESIS. Folliculogenesis is the process in which a recruited primordial follicle grows and develops into a specialized graafian follicle with the potential to either ovulate its egg into the oviduct at mid-cycle to be fertilized or to die by atresia.
What is Oogenesis?
“Oogenesis is the process of formation of female gametes.” Oogenesis is the type of gametogenesis through which ova, also called the female gametes are formed and the produced female gamete is known as an ovum.
What is the difference between primordial and primary follicle?
The main difference between primordial follicle and primary follicle is that primordial follicle is a smaller, dormant follicle with a single layer of flattened granulosa cells whereas primary follicle is much larger, mitotic follicle with cuboidal granulosa cells.
What is Preantral phase?
Preantral phase: Formation and beginning of growth and activation of primordial follicles and growth of primary and secondary follicles. Antral phase: formation of tertiary follicle (antral-filled follicular fluid cavity).
Which is the important characteristics of mammalian ovary?
Two major functions of the mammalian ovary are the production of germ cells (oocytes), which allow continuation of the species, and the generation of bioactive molecules, primarily steroids (mainly estrogens and progestins) and peptide growth factors, which are critical for ovarian function, regulation of the …
Who first discovered mammalian follicle?
Reinier de Graaf
Reinier de Graaf was a Dutch physician, who discovered the follicles of the ovary (known as Graafian follicles), in which the individual egg cells are formed. He was also important for his studies on the pancreas and on the reproductive organs of mammals.
What is folliculogenesis and where does it occur?
In biology, folliculogenesis is the maturation of the ovarian follicle, a densely packed shell of somatic cells that contains an immature oocyte. Folliculogenesis describes the progression of a number of small primordial follicles into large preovulatory follicles that occurs in part during the menstrual cycle.
What triggers folliculogenesis?
Specialized hypothalamic neurons secrete pulses of gonadotropin-releasing hormone (GnRH) into the portal blood vessels, which acts on the gonadotrophs to cause a pulsatile release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which act on ovarian follicle cells to control folliculogenesis.
What is the difference between tertiary follicle and graafian follicle?
the primary oocyte within each tertiary follicle completes its first meiotic division, producing a secondary oocyte and a polar body. the Graafian follicle ruptures to release the secondary oocyte, in a process known as ovulation.