oogenesis

What is oogenesis?

formation of oocytes in ovaries

what are the female gonads?

ovaries

what process occurs at the same time?

follicogenesis

what are the phases in order?

multiplication, growth, maturation

what is the most immature form of oocytes?

oogonia

describe multiplication phase

PGCs arrive at ovary and performs mitosis to become oogonia- this happens up until birth

when is slow growth phase?

before birth

when is fast growth phase?

during puberty

what happens during slow growth?

flat follicular (granulosa) cells form around primary oocyte. this is called a primordial follicle

what is a primary follicle?

cuboidal granulosa cells, zona pellucida

what is a secondary follicle?

more granulosa cells, antrum

what is a terciary (graafian) follicle?

full antrum, theca interna, theca externa, corona radiata

what is the theca interna made of?

capillaries

what is the theca externa made of?

fiber

what is the corona radiata?

layer of granulosa cells directly around oocyte

what occurs during maturation?

primary oocyte goes through meiosis 1 and turns into a polar body and a secondary oocyte. Then it goes through meiosis 2 and turns into a polar body and a fertilized egg

meiosis 2 only occurs if_____

sperm penetration occurs