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The grovvth
and develop
of
fetus
depends
on
absorbing
nutrition
and
oxygen
from
the body
of npther.
ltlornally placenta
plants
on
the
anteroqsterior
or
lateral
tmll
of uterine
body.
If doctors
frnd that
a
placenta is
situated
in
the
lovter segment
of the
uterus
or
covers
on
the
internal
orifice
of the
uterine
cervix
after
tvventy
trveeks
of
pregnancy,
such
placena
is
defined as
a
placenta
previa.
This
is
a
severe
disease
endangering
the
lives
of
both
the
rnother
and
the
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