conception, implantation and placentation Flashcards
Small follicle or type 1, 2, 3 (25 cells) less than 50 μ
primordial follicle
Preantral follicle or type 4 (26-100 cells) type 5 (101-300 cells) up to 200 μ
primary follicle
Small antral type 6 (301-500 cells), 500 μ
secondary follicle
Large antral type 7 (501-1000 cells) 1000-6000 μ
Tertiary follicle
Large antral type 8 (>1000 cells) greater than 6000 μ
preovulatory- graaffian follicle
formation of follicles
at 20 weeks of fetal life
Tonic growth phase Occurs independent of LH / FSH During oral contraceptive use During pregnancy Class 1 to Class 4 follicles
GnH independent phase
Requires LH / FSH
Class 5 to Class 8 follicles
GnH dependent phase
The development of a primordial follicle to a preovulatory follicle takes in excess of ____ days.
120
The meiosis of oocytes is arrested at __________ of the first meiotic division. Meiotic division is completed just prior to ovulation, and in humans this arrest can be 50 years long
prophase I
binding protein of sperm to zona pellucida
ZP3
endometrium stromal cells are transformed by steroid hormones into the
decidua which allows implantation
Lasts about 4 days.
Occurs around 6-10 days after the LH peak
Day 20-23 after LMP
implantation window
decidual changes is a mark of a __________
Expansion of above
Cells fill with lipid and glycogen
Polyhedral shape
pregnancy
Glands of spongiosa secrete and form unequal areas of hypersecretion
Arias-Stella phenomenon
why is there epigenetic silencing of chemokine expression in the decidual stoma cells
it kills the maternal immune cells thus immune system is blunted
what anchors the placenta to the wall?
anchoring villa
