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Diagram showing the reduction in number of the chromosomes in the process of maturation of the ovum; the process is known as meiosis Main article: Oogenesis The formation of an oocyte is called oocytogenesis, which is a part of oogenesis. [ 1 ]
Oogenesis starts with the process of developing primary oocytes, which occurs via the transformation of oogonia into primary [oocyte]s, a process called oocytogenesis. [11] From one single oogonium, only one mature oocyte will rise, with 3 other cells called polar bodies.
Oocytogenesis : third trimester primary Oocyte: diploid/46: 4C: Ootidogenesis (meiosis 1) (Folliculogenesis) -- polar body separated: Dictyate in prophase I until ovulation secondary Oocyte: haploid/23: 2C: Ootidogenesis (meiosis 2) -- polar body separated: Halted in metaphase II until fertilization Ootid: haploid/23: 1C: Maturation: Minutes ...
An ovarian follicle is a roughly spheroid cellular aggregation set found in the ovaries.It secretes hormones that influence stages of the menstrual cycle.At the time of puberty, women have approximately 200,000 to 300,000 follicles, [1] [2] each with the potential to release an egg cell (ovum) at ovulation for fertilization. [3]
Diagram of folliculogenesis, starting from pre-antral (late secondary), courtesy NCBI. Phases of development. Folliculogenesis is continuous, meaning that at any time ...
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Human fertilization is the union of an egg and sperm, occurring primarily in the ampulla of the fallopian tube. [1] The result of this union leads to the production of a fertilized egg called a zygote, initiating embryonic development.
Diagram of a human egg cell Ovum and sperm fusing together The process of fertilizing an ovum (top to bottom). In all mammals , the ovum is fertilized inside the female body. Human ova grow from primitive germ cells that are embedded in the substance of the ovaries .