OOGENESIS
formation of egg cells
oogenesis
2 major parts of the ovary
medulla and cortex
outer part of the ovary where you can find the developing cortical follicles ala ovarian follicles
cortex
inner part of ovary where it contains a lot of blood vessels
medulla
made up of primary oocyte and follicle cells
FOLLICLE
large cell at the center of follicle
primary oocyte
it surrounds the oocyte
follicle cells
steps in oogenesis
PRIMORDIAL GERM CELLS
OOGONIUM
PRIMARY OOCYTE
they will proliferate, be in close with the follicle cells, surrounded by stromal cells as they grow and differentiate to become a primary oocyte
OOGONIUM
will enter prophase 1 and stop at diplotene stage
PRIMARY OOCYTE
stops at diplotenet and continue meiosis 1 when you reach puberty
DIPLOTENE BLOCK
also called the granulosa cells
FOLLICLE CELLS
function of follicle cells
they secrete estrogen, materials for zona pellucida and liquor folliculi
before the beginning of the yolk
pre-vitellogenesis
youngest and smallest follicle
primordial follicle
cells that secretes estrogen and a gelatinous substance that will soon form a layer between the primary oocyte and follicle cells
CUBOIDAL CELLS
1 LAYER
UNILAMINAR PRIMARY FOLLICLE
a layer between the primary oocyte and follicle cells that is ckear in multilaminar
ZONA PELLUCIDA
several layers that undergo mitosis, the more the cells, the more the secretion
MULTILAMINAR
cells found at the ovarian stroma and outside the follicle that forms the theca interna
STROMAL CELLS
those are everything inside the germinal epithelium
OVARIAN STROMA
layer surrounding the follicle and contains squamous or flat cells
THECA INTERNA
beginning of the yolk
VITELLOGENESIS
it undergo slow growth
pre vitellogenesis
it undergo fast growth
vitellogenesis
fluid from the follicle, eventually come together and form large pond
LIQUOR FOLLICULI
the cavity that is filled with liquor folliculi
antrum
pag may antrum, anong follicle yun
secondary follicle
this layer has cuboidal cells that secretes also surrounded by theca externa cells
theca externa
a layer inside the zona pellucidamade up of microvilli from primary oocyte and follicle cells
zona radiata
follicle cells that accompany and protects the ovulated egg
corona radiata
largest follicle with secondary oocyte
MATURE GRAAFIAN FOLLICLE
secondary oocyte will enter meiosis 2 but stop at metaphase 2, what do you call that
metaphase block
main function of the liquor folliculi
it provides high hydrostatic pressure that will push the oocyte during ovulation
a layer of follicle cells around the antrum
STRATUM GRANULOSUM
acts like a glue, a cluster of cells why the corona radiata and stratum granulosum are attached with each other
CUMULUS OOPHORUS
enumerate how a yolk is formed
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the primary oocyte is at the germinal vesicle stage
DIFFERENTIATION
a very large nucleus
germinal vesicle
it will break into vesicles and move towards the cortical region and is important for fertilization
golgi apparatus
aka cortical vesicles
golgi apparatus
break into vesicles and increase the surface area of the cell for ribosomal attachment
ENDOPLASMIC RETICULUM
it will increase in number and form clusters called mitochondrial cloud and surround the endoplasmic reticulum vesicles
MITOCHONDRIA
looped extensions forming the lampbrush chromosomes to allow transcription
CHROMOSOME
chromatins that are pushed upwards making it look like a brush, and when exposed it will allow transcription
LAMPBRUSH CHROMOSOME
it function for the synthesis of rRNA and materials needed for the future embryo
NUCLEOLI
a process ofmreplication where it creates a lot of nuclear DNA and increase the number of DNA without cell division
NUCLEAR AMPLIFICATION
increase in size forming the germinal vesicle
NUCLEUS
product of meiosis 2
ootid
the ootid is the zygote
remember that, iisa lang sila
if the egg is not fertilized by a sperm, itbwill degenerate in meiosis 2, why?
to conserve energy