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The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or oestrous cycle, following the release of a secondary oocyte from the follicle during ovulation. The follicle first forms a corpus hemorrhagicum before it becomes a corpus luteum, but the term refers to the visible collection of blood, left ...
During a pregnancy, the corpus luteum remains on the ovary releasing progesterone which will maintain a state of uterine quiescence and close the cervix until the delivery of the fetus. Alternatively if no implantation of a blastocyst occurs, the corpus luteum is degraded to a corpus albicans (scar tissue) by PGF2α released by uterine ...
After ovulation and during the luteal phase, the uterine endometrium is in the secretory phase which is characterized by the production of progesterone from the growing corpus luteum. Progesterone inhibits endometrial proliferation, and preserves uterine tissue in preparation for fertilized egg implantation.
Human ovary with developed corpus luteum. Maternal recognition of pregnancy is a crucial aspect of carrying a pregnancy to full term. Without maternal recognition to maintain pregnancy, the initial messengers which stop luteolysis and promote foetal implantation, growth and uterine development finish with nothing to replace them and the pregnancy is lost.
5 - Corpus luteum 6 - Deterioration of corpus luteum. 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 ...
If the egg is not fertilized, the corpus luteum degenerates (body albicans); if it is implanted, it remains until three months of pregnancy, where its function is replaced by the placenta (production of progesterone and estrogen). The level of LH (necessary to keep the corpus luteum alive) is replaced by human chorionic gonadotropin. [19]
During early pregnancy, the amnionic epithelium is sparsely covered in microvilli, which increase in number throughout pregnancy. [4] The function of this microvillous surface is associated with a densely-packed glycocalix with anionic binding sites; these are thought to be involved with intra-amnionic lipid synthesis. [ 4 ]
As a paracrine hormone, relaxin helps the non-pregnant uterus become ready for pregnancy. [23] Women's endometrium contains relaxin, which is an essential component that helps prepare the body for early pregnancy. [21] The endometrium is transformed into decidua during the early pregnancy maintenance procedure. [21]