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CONTROL OF OVULATION AND CORPUS LUTEUM (CORPUS LUTEUM (Secretes…
CONTROL OF OVULATION AND CORPUS LUTEUM
OVULATION
The preovulatory surge of luteinizing hormone (LH)
initiates the critical changes in the follicle that affects its endocrine organ status and result in the release of oocyte
the oocyte and granulosa are kept under control by the production of inhibitory substances
Oocyte-inhibiting factor prevents oocyte from resuming meiosis
Luteinizing-inhibiting factor prevents granulosa from prematurely being changed into luteal tissue
The impact of LH surge blocks the production of these two factors.
the surge of LH on granulosa is to allow initiation of the process luteinization (transform cells from estrogen to progesterone secretion)
the preovulatory surge of LH is to cause granulosa to produce substances (relaxin and prostaglandin) that affect continuity of the connective tissue of the thecal layers of the follicle
CORPUS LUTEUM
Secretes progesterone to prepares the uterus for te initiation and maintenance of pregnancy
Luteinization
MAINTENANCE OF CORPUS LUTEUM
slow pulsatile pattern of LH release in domestic animals
REGRESSION OF CORPUS LUTEUM IN NON-PREGNANT LARGE DOMESTIC ANIMALS
Controlled by uterine secretion of prostaglandin
OVARIAN CYCLE
Governed by internal mechanisms; estrogen from antral follicle initiates the ovulatory release of gonadotropin
Thre are 3 phases of ovarian cycle:
Follicular phase
Ovulation
Luteal phase
the process that granulosa cells undergo during the change from estrogen to progesterone secretion
begins with the onset of the preovulatory LH surge and accelerates with ovulation
forms from wall of the follicle that colapsed and folded after ovulation.