Significance of Oogenesis

What is Gametogenesis?

Gametogenesis is the formation of both male and female gametes, known as gametogenesis. It is of two types, i.e., spermatogenesis and oogenesis. The process of formation of the ovum is known as oogenesis whereas the process of formation of the sperm is known as spermatogenesis. In this article, we will look into the oogenesis....

What is Oogenesis?

Oogenesis is the complex process of egg cell development in females. It begins before birth, with oogonia, which differentiates into primary oocytes. These primary oocytes get arrested in the prophase I of meiosis. During a woman’s menstrual cycle, some primary oocytes get activated and continue meiosis. Ovulation leads to the release of the secondary oocyte from the Graadian follicle. If fertilization occurs, that would lead to the completion of meiosis II, forming a mature ovum and a second polar body. If fertilization does not occur meiosis II will not take place and the follicle will denature and get ejected out of the body with menstrual blood....

Process of Oogenesis

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Phases of Oogenesis

In oogenesis, the process of egg cell development in females, there are three main phases;...

Ovulation

Ovulation is an important event in the menstrual cycle where a mature Graafian follicle, in response to hormonal signals i.e. a surge in Luteinizing hormone (LH), ruptures. This releases the secondary oocyte from the ovary into the fallopian tube, making it available for potential fertilization. Ovulation marks the midpoint of the menstrual cycle and is a key process in human reproduction....

Oogenesis in Non-Human Mammals

In non-human mammals, oogenesis begins in the germinal epithelium of the ovary, which creates ovarian follicles. Oogenesis involves three stages: oocytogenesis, ootidogenesis, and maturation to form the ovum. Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes....

Ovarian Aging

Menopause is the last step in the process mentioned as ovarian aging. The age-connected decline in follicle numbers gives orders to begin the cycle irregularly. The equivalent decomposition in oocyte quality contributes to a drop in fertility and the final presence of natural sterility. Endocrine swap mostly reduces ovarian stimulating factors at the hypothalamic-pituitary unit....

Hormonal Control of Oogenesis

Hypothalamus produces GnRH which excites the anterior lobe of the pituitary gland to produce LH and FSH. Graafian follicles and the maturation of the oocyte inside the follicle are excited by the FSH hormone to accomplish meiosis I to form a secondary oocyte. The emergence of estrogen is also excited by FSH. Whereas, breaking of the mature Graafian follicle and release of secondary oocyte prompt by LH. The remaining residue of the Graafian follicle is excited by LH to develop into corpus luteum. The ascending level of progesterone checks the ejection of GnRH and, in succession, checks the production of FSH, LH & progesterone....

Significance of Oogenesis

Following are the significance of oogenesis:...

Oogenesis Timeline and Stages

Cell Type Chromosomes Chromatids Process Time of completion Oogonium diploid/46(2N) 2C Oocytogenesis (mitosis) Third trimester primary oocyte diploid/46(2N) 4C Ootidogenesis (meiosis I) (Folliculogenesis) Dictyate in prophase I for up to 50 years secondary oocyte haploid/23(1N) 2C Ootidogenesis (meiosis II) Halted in metaphase II until fertilization Ootid haploid/23(1N) 1C Ootidogenesis (meiosis II) Minutes after fertilization Ovum haploid/23(1N) 1C...

FAQ’s – What is Oogenesis?

1. What is Oogenesis?...