The menstrual cycle involves the thickening and shedding of the uterine lining each month from puberty to menopause except when pregnant. It occurs in phases regulated by hormones from the pituitary gland and ovaries. In the follicular phase, follicle stimulating hormone (FSH) causes follicle development and estrogen release, thickening the uterine lining. Near ovulation, luteinizing hormone (LH) triggers follicle rupture and egg release. If no fertilization, progesterone levels fall and menstruation begins as the lining is shed. Fertilization usually occurs in the fallopian tubes as an egg fuses with sperm. The fertilized egg may then implant in the uterine lining during the luteal phase if pregnancy occurs.

1. MENSTRUAL
CYCLE
FERTILISATIO
N AND
IMPLANTATIO
N
MADE BY - AMITA RANJAN
XIITH SCIENCE (BIOLOGY)

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The process in a woman of discharging
blood and other material from the lining of
the uterus at intervals of about one lunar
month (28 days) from puberty until the
menopause , except during pregnancy

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it
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PHASES OF MENSTRUAL CYCLE

4. Begins when estrogen levels are
low.
Anterior pituitary secretes FSH and
LH , stimulation follicle to develop.
 Cells around egg enlarge, releasing
estrogen.
This causes this uterine lining to
thicken.
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LH and FSH still being released, for
another 3-4days.
Follicle ruptures, releasing ova into
the Fallopian tubes.
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Now empty follicle changesto ayellow colour,
becomescorpusluteum.
Continuesto secrete estrogen, but now beings
toreleaseprogesterone.
Progesterone further developsuterine
lining.
If pregnant, embryo will release
hormones topreserve corpus luteum
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7. MENSTRUATION
If no embryo, the corpus luteum begins
to disintegrate.
Progesterone levels drop, uterine
lining detaches, menstruation can
begin.
Tissue, blood, unfertilized egg all
discharged.
Can take from 3-7 days.

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AN OVERVIEW TO MENSTRUAL CYCLE
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Table
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consectetur adipiscing elit.
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HORMONAL CONTROL OF MENSTRUAL
CYCLE

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FERTILISATION
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11. MAJOR EVENTS
OF
FERTILISATION
Fertilisation refers to the
fusion of the egg(ovum) and
sperm and usually takes
place in the upper third of the
fallopian tube.

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FERTILISATION AND IMPLANTATION
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IMPLANTATION
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THANK YOU FOR
WATCHING
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