The follicle stages

Home Forums Chat Room The follicle stages

This topic contains 16 replies, has 17 voices, and was last updated by Apple Apple 1 year, 2 months ago.

Viewing 15 posts - 1 through 15 (of 17 total)
  • Author
    Posts
  • #112
    Karry
    Karry
    Participant

    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 enter the menstrual cycle. How it happens? How follicles grows and what stages do they have? Primordial follicle. At the time of birth all the surviving primary oocytes are surrounded by thin, single layers of so-called follicular epithelial cells. These are delimited from the rest of the ovarian stroma by a thin basal lamina. Follicular epithelial cells are former coelomic epithelial cells. The primordial follicles always form the majority of the follicles in the ovary.

    #113
    Kim
    Kim
    Participant

    Primary follicle. In the transition of the primordial follicles into primary follicles the follicular epithelium that surrounds the oocyte becomes iso- to highly prismatic. Secondary follicle. When primary follicles survive, secondary follicles with follicular epitheliums encompassing multiple rows are engendered. This is now called the stratum granulosum. In the secondary follicles a glycoprotein layer, the pellucid zone, between the oocyte and follicular epithelium becomes visible. Cytoplasmic processes of the granulosa cells that lie upon it reach the oocyte through the pellucid zone and thereby assure their maintenance function. Outside the basal lamina the stroma ovarii organizes itself to become theca folliculi cells.

    #114
    Lada
    Lada
    Participant

    Tertiary follicle. If the secondary follicles survive, tertiary follicles are engendered. Their identifying characteristic is a fluid-filled cavity, the antral follicle. The oocyte lies at the edge in a mound made of granulosa epithelial cells, the cumulus oophorus. In the meantime it has grown so large that its cellular nucleus has attained the size of a whole primordial follicle. The connective tissue around the follicle has already clearly differentiated itself into a theca interna, well supplied with capillaries, out of large, lipid-rich cells (hormone production) and a theca externa, which forms a transition to the stroma ovarii and contains larger vessels.

    #115
    Mi6
    Mi6
    Participant

    Decisive for a successful follicle growth is a well-developed net of capillaries in the theca interna. The precise steering mechanism that leads to the selection of a follicle and its subsequent maturation to become a graafian follicle is still unknown. Before ovulation a growth spurt of the tertiary follicles takes place. Graafian follicle. This corresponds to an especially large tertiary follicle that can be expected to suffice for ovulation. As for me human’s organism is so interesting and i envy doctors which can make different reasearches and see hoe human organism works )))) When I was a child I had a dream to become a doctor but unfortunately not our dreams come true.

    • This reply was modified 2 years, 2 months ago by Mi6 Mi6.
    #117
    Sandra
    Sandra
    Participant

    Yes, not all our child’s dreams come true but think it should be like this. Dreams are only dreams but reality is reality. As for the process of follicle growing… Under the influence of the sex hormones some of them are able to develop further to one or more of the subsequent stages in the following 50 years. Although this further development can already take place sporadically in the time before birth and up to puberty, the main part occurs as soon as a regular hormonal cycle is established. Particularly the last phase of the maturation of a tertiary follicle to become a large follicle, ready to rupture, remains reserved for the time of regular cycles.

    • This reply was modified 2 years, 2 months ago by Sandra Sandra.
    #253
    Alice
    Alice
    Participant

    At the time of birth all the surviving primary oocytes are surrounded by thin, single layers of so-called follicular epithelial cells. These are delimited from the rest of the ovarian stroma by a thin basal lamina. Follicular epithelial cells are former coelomic epithelial cells. The primordial follicles always form the majority of the follicles in the ovary.Under the influence of the sex hormones some of them are able to develop further to one or more of the subsequent stages in the following 50 years. Although this further development can already take place sporadically in the time before birth and up to puberty, the main part occurs as soon as a regular hormonal cycle is established. Particularly the last phase of the maturation of a tertiary follicle to become a large follicle, ready to rupture, remains reserved for the time of regular cycles.

    #269
    Jody
    Jody
    Participant

    In the transition of the primordial follicles into primary follicles the follicular epithelium that surrounds the oocyte becomes iso- to highly prismatic. When primary follicles survive, secondary follicles with follicular epitheliums encompassing multiple rows are engendered. This is now called the stratum granulosum. In the secondary follicles a glycoprotein layer, the pellucid zone, between the oocyte and follicular epithelium becomes visible. Cytoplasmic processes of the granulosa cells that lie upon it reach the oocyte through the pellucid zone and thereby assure their maintenance function. Outside the basal lamina the stroma ovarii organizes itself to become theca folliculi cells. If the secondary follicles survive, tertiary follicles are engendered. Their identifying characteristic is a fluid-filled cavity, the antral follicle. The oocyte lies at the edge in a mound made of granulosa epithelial cells, the cumulus oophorus. In the meantime it has grown so large that its cellular nucleus has attained the size of a whole primordial follicle. The connective tissue around the follicle has already clearly differentiated itself into a theca interna, well supplied with capillaries, out of large, lipid-rich cells (hormone production) and a theca externa, which forms a transition to the stroma ovarii and contains larger vessels.

    #292
    Kate
    Kate
    Participant

    This study aimed to investigate the developmental competence of ovum pick-up collected oocytes on three stages of the follicular wave: Days 2, 5 and 8. A group of 11 cows was used in successive cycles to perform ovum pick-up on either Day 2, 5 or 8 of an induced follicular wave (three sessions per stage). Follicular waves were initiated by puncturing the dominant follicle and all other follicles sized > or = 5 mm at Days 5-7 of the cycle. The plasma progesterone concentrations did not differ between the days of ovum pick-up: 4.0 +/- 1.8, 5.1 +/- 1.6 and 5.2 +/- 1.7 ng/ml for Days 2, 5 and 8, respectively. The proportion of oocytes with three or more layers of non-expanded cumulus cells was higher for Day 5 than Day 8, while Days 2 and 5 did not significantly differ from each other (85, 96 and 68% of 113, 60 and 101 oocytes for Days 2, 5 and 8, respectively). The proportion of oocytes competent to develop a blastocyst in an in vitro production system was higher for Days 2 and 5 than for Day 8: 27, 29 and 15% for the oocytes with fair to good cumulus investment and 23, 27 and 11%, respectively, when all oocytes were taken in account. This indicates that the dominant follicle reduces the developmental competence of oocytes from subordinate follicles at a relatively late stage of dominance. This finding has practical consequences for the handling of cows that undergo ovum pick-up only once or very irregularly. The embryo yield can then be improved by performing the ovum pick-up at Days 2-5 of the cycle or 2-5 days after ablation of the large follicles.

    #323
    Milka
    Milka
    Participant

    During the follicular phase, an egg follicle on an ovary gets ready to release an egg. Usually, one egg is released each cycle. This process can be short or long and plays the biggest role in how long your cycle is. At the same time, the uterus starts growing a new endometrium to prepare for pregnancy.The last 5 days of the follicular phase, plus ovulation day, are your fertile window. This is when you are most likely to become pregnant if you have sex without using birth control.The menstrual cycle is the series of changes your body goes through to prepare for a possible pregnancy. About once a month, the uterus grows a new, thickened lining (endometrium) that can hold a fertilized egg. When there is no fertilized egg to start a pregnancy, the uterus then sheds its lining. This is the monthly menstrual bleeding (also called menstruation or menstrual period) that you have from your early teen years until your menstrual periods end around age 50 (menopause).

    #346
    Molly
    Molly
    Participant

    Within the study of female fertility it is essential to know what your ovarian reserveis. Hormonal analysis for assessment (hormone AMH, FSH, LH, estradiol, etc) and vaginal ultrasound in various forms are made.Currently is still counting ovarian follicles, the truest estimate of ovarian reserve in a given patient. This reserve is expressed in number of follicles per ovary observed in the first days of the cycle (2nd to 5th) by performing a vaginal ultrasound. These follicles are called “antral”. Ultrasound also allows us to follow the evolution and growth of follicles both in spontaneous cycle as in a stimulated cycle fertility treatment.Depending on the number of antral follicles, a woman is considered to have adequate or normal ovarian reserve if the count is 6-10. Low ovarian reserve, if the count is less than 6 ovarian reserve and high ovarian reserve if is greater than 12. Follicular size in this cycle phase is 2 to 10 mm.

    #426
    Monica
    Monica
    Participant

    The ovaries consists of many follicles which release hormone, estrogen. into the bloodstream. Estrogen causes thickening of the endometrial lining of the uterus. That is the start of preparation of endometrial bed After 14 days one most mature follicle of ovary burst and release an egg, known as ovulation. The follicle from which the egg comes out becomes the corpus luteum, it produces the hormones estrogen and, in larger amounts progesterone which is necessary for the maintenance of bed of endometrial lining in uterus to receive fertilized ova. If fertilization and implantation do not occur, Secretion of hormones are stopped and the surface lining of bed is shed and, known as periods or menstrual flow.

    #497
    Bridget
    Bridget
    Participant

    An ovarian follicle progresses through several distinct phases before it releases its ovum. During the first five months of development, a finite number of primordial follicles form in the fetal ovary. These follicles consist of oocytes surrounded by a single layer of squamous follicular cells. These primordial follicles remain in the process of the first meiotic division. At puberty, they begin to develop further and become primary follicles.At the start of each menstrual cycle a limited number of primordial follicles are triggered to develop. The first apparent histological stage is the early primary follicle that consists of a central oocyte surrounded by a single layer of follicular cells which have become cuboidal. The zona pellucida is a thin band of glycoproteins that separates the oocyte and follicular cells. Proteins on the surface of sperm will bind to specific glycoproteins in the zona pellucida.The late primary follicle stage is reached when the follicular cells proliferate into a stratified epithelium known as the zona granulosa. The zona pellucida enlarges and can be seen even more clearly in this image.

    #631
    Klara
    Klara
    Participant

    You should undesrtand that not all our child’s dreams come true but think it should be like this. Dreams are only dreams but reality is reality. As for the process of follicle growing… Under the influence of the sex hormones some of them are able to develop further to one or more of the subsequent stages in the following 50 years. Although this further development can already take place sporadically in the time before birth and up to puberty, the main part occurs as soon as a regular hormonal cycle is established. Particularly the last phase of the maturation of a tertiary follicle to become a large follicle, ready to rupture, remains reserved for the time of regular cycles.

    #664

    Daria
    Participant

    Folliculogenesis called progressive development of follicles from the primordial stage to preovulatory (tertiary) follicles or graafovyh bubbles. The term “ovarian follicle” denotes a cell-tissue complex (ovo-somatic gistion), consisting of the female sex cell and its surrounding somatic tissues – derivatives rete ovarii. Folliculogenesis occurs in women only with the onset of puberty. Stages folliculogenesis is primordial follicle development in primary, primary – secondary and further secondary – Tertiary follicle or antral follicle. In the process of folliculogenesis sex cell undergoes a stage of great growth, and in the final stages of folliculogenesis resumes meiosis.

    #727
    Ana
    Ana
    Participant

    actually i do not know a lot about it but still i think that i may help you with this problem. first is primary follicle. when primary follicles survive, secondary follicles with follicular epitheliums encompassing multiple rows are engendered. this is now called the stratum granulosum. in the secondary follicles a glycoprotein layer, the pellucid zone, between the oocyte and follicular epithelium becomes visible. cytoplasmic processes of the granulosa cells that lie upon it reach the oocyte through the pellucid zone and thereby assure their maintenance function. that is it.

Viewing 15 posts - 1 through 15 (of 17 total)

You must be logged in to reply to this topic.

Members Currently Active: 0
No users are currently active
Members active within the past 24 hours: 5
DevilO, Mi6, ocyfalale, ovykipus, Sandra
Forum Statistics
Threads: 49, Posts: 639, Members: 1,930
Welcome to our newest member, okeqery