Ch. 8 Ovigenesis and Fertilization

oogenesis

formation and maturation of female gametes

when does oogenesis start

prenatal stages

oogonia multiply by

mitosis until near birth

two stages of meiotic divisions

meiosis 1 and meiosis 2

meiosis 1

arrested (stop developing) at late prophase

dictyate oocyte

arrested oocyte

no oocyte

mature before puberty

growth and maturation occurs

in cycles after puberty

only oocytes in dominant follicles

mature

follicular development occurs in

waves/cohorts

The zona pellucida develops when 

when oocytes grows 

zona pellucida

outer membrane of the follicle

what hormone is produced by the mature follicle

estrogen

1st follicle, secondary follicle, tertiary follicle, graffian follicle

antrum forms as

dominant follicles emerge

ovulation is induced by what hormone

LH

meiosis 2 is arrested at 

metaphase 

meiosis 2 only occurs of

fertilization occurs

meiosis 1 yields

secondary oocyte and 1st polar body

meiosis 1 occurs before

ovulation

Ater Estrogen triggers LH what happens to oocytes in Meiosis 1

oocytes are freed into follicular fluid and meiosis 1 resumes