Oogenesis and spermatogenesis Flashcards Preview

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Flashcards in Oogenesis and spermatogenesis Deck (19):
1

when does oogenesis begin?

in utero

2

what is the earliest recognisable female germ cell?

primordial germ cell

3

what are the 2 female germ cells?

primordial germ cell

oogonia

4

what cells enter meiosis?

oocytes

5

what is the first polar body?

one of the 2 products in the first meiotic division

6

presence of 2 polar bodies= what?

sperm entry and completion of second meiotic division

7

what phase is this?

first half
maturation of egg, ready for ovulation mid cycle

follicular phase

8

what phase is this?

second half
development of corpus luteum

induces preparation of tract for pregancy

luteal phase

9

FSH and LH come from where?

anterior pituitary

10

what does FSH do?

stimulate follicle development (acts on ovary)

11

what does LH do?

acts on ovary

stimulates follicle maturation, ovulation and development of corpus luteum

12

when the corpus luteum degenerate what does it form?

corpus albicans

13

at what time (approx) does the placenta take over the role of corpus luteum ?

week 6

14

in males what 2 hormones stimulate spermatogenesis?

FHS and testosterone

15

testosterone comes from what cells?

interstitial cells

16

what acts on the interstitial cells to cause testosterone secretion/

LH

17

what does Inhibin do ?
(male)

decrease FSH secretion

18

too much testosterone does what?

decrease release of GnRH and LH

19

what do the sertoli cells in the seminiferous tubules secrete?

androgen binding globulin and inhibin