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Ovarian and Menstrual Cycle (Glossary (Easiest to start at follicular…
Ovarian and Menstrual Cycle
Follicular phase
stimulated ovary releases egg
follicle grows in size
egg completes meiosis 1 and arrests in stage 2
follicle continues to grow
which in turn produces estrogen
estrogen circulates through blood
high estrogen detected by brain
brain in response releases GnRH
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and thickens uterus lining
at same time
Proliferative phase
starts
Luteal phase
remain of follicle (without egg) forms corpus luteum
which produces estrogen and progesterone
and thickening in uterus lining which causes
secretion of chemicals to prepare for fertilization
if not fertilized
if fertilized
corpus luteum breaks down
estrogen and progesterone levels decrease
uterus lining shed
after approximately 7 days
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this is also called
menses
corpus luteum stays intact
it continues to produce estrogen and progesterone
maintains uterus lining to support development of fetus
also the start of
Secretory phase
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Glossary
Easiest to start at follicular phase and follow through
GnRH - Gonadotropin releasing hormone
LH - Luteinizing hormone
FSH - Follicle stimulating hormone
Estrogen - hormone that comes from ovaries
Progesterone - hormone stimulates uterus lining to thicken
Follicle - fluid filled sac that contains egg
Corpus Luteum - remnants of follicle after egg is released
