Oogenesis, Uterine and Ovarian Cycle Flashcards
_____ is ovam production, beginning at birth and ending at menopause
Oogenesis
_____ are stem cells in females that complete division between 3rd and 7th month of fetus development
Oogonia
Oogonia produce daughter cells called?
primary oocytes
Primary ooctyes only proceed to prophase of Meiosis 1 and then halts until
a female reaches puberty
When a female reaches puberty, what hormone triggers the Ovarian Cycle to begin?
FSH
Each female is born with ______ follicles, by puberty they have _______ follicles
2 million, 400,00
Eggs degenerating or atresia happens at?
menopause
The Ovarian Cycle has 2 phases
Follicular Phase (preovulatory) Luteal Phase (postovulatory)
The Ovarian Cycle has how many steps?
6
FSH stimulates primordial follicles, causing it to develop into primary follicles
1) Formation of Primary Follicles
Follicle wall thickens and follicular fluid is produced causing expansion and division of inner and outer layer of follicles
2) Formation of Secondary Follicles
This occurs between day 10-14 of cycle. LH levels begin to increase, causing oocyte (secondary ooctye) to complete meiosis 1 and stops after metaphase of meiosis 2
3) Formation of Tertiary Follicle
Tertiary follicle releases secondary oocyte to be released from ovary and into uterine tube
4) Ovulation
The now empty tertiary follicle creates the corpus luteum due to increase in LH, the corpus luteum produces hormones called progestins which prepares uterine wall for pregnancy
5) Formation of the Corpus Luteum
12 days after ovulation, if fertilization did not occur, progesteron and estrogen levels decrease amd fibroblasts destroy corpus luteum leaving scar tissue called corpus albicans. The End of the ovarian cycle
6) Degeneration of Corpus Luteum
The Uterine Cycle
series of repeated changes to endometrium every 28 days
Includes Menses, Proliferative Phase, and Secretory Phase
the functional zone is degenerated, “spiral arteries” constict which reduces bloodflow to the area causing reduction of oxygen and nutrients. Arteries finally rupture and dying tissue sloughed off. Lasts 1-7 days.
Menses
epithelial cells of the basilar zone starts to restore the function zone
Proliferative
the endometrial glands enlarge and accelerate secretion and growth. “spiral arteries” grown and spiral though the functional zone. This phase lasts as long as corpus luteum
Secretory phase
