ovulation and luteal function Flashcards
what species is parthenogenesis observed in
-some snakes
-fish
-monitor lizards
what is parthenogenesis
ovum develops into a new individual without fertilization
what events does the pre-ovulation LH surge cause
-follicular rupture
-extrusion of oocyte(resumption of meiosis)
-collapse of follice
what phase does oocyte arrest post-ovulation? when does it resume?
metaphase II, resumes after fertilization
What is luteinization? what is it triggered by?
process that transforms granulosa and theca cells into luteal cells. triggered by LH surge
what type of luteal cells do theca cells become from luteinization
small luteal cells
what type of luteal cells do granulosa cells become from luteinization
large luteal cells
primary hormone production of theca cells
androstenedione(testosterone)
primary hormone production of granulosa cells
estrodiol
primary hormone production of large luteal cells and small luteal cells
progesterone
what is hypertrophy? what cells undergo it?
increasing cell size(3-fold), undergone by large luteal cells
what is hyperplasia? what cells undergo it?
increase cell numbers(5-fold), undergone by small luteal cells
what is vascularization of CL initiated by
angiogenic factors from follicle
actions of progesterone
-reduce GnRH pulse amplitude and frequency
-prevent behavioral estrus
-stop preovulatory LH surge
-reduce myometrial(uterine) tone(contractions)
-stimulate endometrial gland development and secretion
-stimulate alveolar development in mammary glad
hormone fluctuations around ovulation
-drop in progesterone
-increase in estrogen
-LH surge
-increase progesterone
