oogenesis Flashcards
Gametogenesis in females is called
OOGENESIS
process begins with the ovarian stem cells or
oogonia
Oogonia are formed during fetal development, and divide via ______.
mitosis
Oogonia produces _______ in the fetal ovary when?
PRIMARY OOCYTES, PRIOR TO BIRTH
These primary oocytes are then ARRESTED in this stage
meiosis I
RESUMES AT PUBERTY until the woman is NEAR MENOPAUSE
Meiosis-I
After Meiosis-I, how many cells are produced?
two
what are the two cells produced AFTER MEIOSIS 1?
Secondary oocyte
first polar body
t/f
MEIOSIS 1 results in two identical cells.
t
MEIOSIS 1 does not results in two identical cells.
the ______ is divided UNEQUALLY, and one _____ is much LARGER than the other.
cytoplasm, daughter cell,
what cell eventually leaves the ovary during ovulation
larger cell (the secondary oocyte)
If FERTILIZATION OCCURS, then ______ of a secondary oocyte is completed
Meiosis
________ then resumes, producing ______ that is fertilized by a (haploid) sperm and produces diploid
(two cell) zygote.
Meiosis II, one haploid ovum
If FERTILIZATION DOES NOT OCCUR, the secondary oocyte _______ the 2nd meiotic division, and ________ after ovulation.
fails to complete, degenerates in about 24 hours
Phases of Follicular development
Primordial follicle
primary follicle
secondary follicle
tertiary follicle
ovulating follicle
corpus luteum
Each primary oocyte is surrounded by follicular cells and is called
Primordial follicle
AT PUBERTY, the primordial follicle STARTS GROWING under influence of FSH and LH and develops into
primary follicle
As the primary follicle grows, the follicular cells surrounding the primary oocyte start growing, and NEWLY GROWING CELLS are called
granulosa cells.
The _________ starts developing
between the granulosa cell and primary
oocyte;
that layer is called ______.
glycoprotein layer, zona pellucida
As the follicle grows, the ______ are developed
theca cells
also called THECA EXTERNA and ENCIRCLES the granulosa cells
theca cells
granulosa cells start secreting ________ which develop the CAVITY called _______
FOLLICULAR FLUID, antrum.
When the ANTRUM IS DEVELOPED in the follicle that is termed as _____
secondary follicle
Theca cells work with the granulosa cells to
produce______ .
estrogens
Follicles in which the ANTRUM HAS BECOME LARGE AND FULLY FORMED are considered
tertiary follicles
Once the FOLLICLE IS MATURE, it _____ and
_____ the oocyte. Cells remaining in the
follicle then develop into ________
ruptures, releases, the corpus luteum.
