At
beginning
of
____________________
week
of
gestation
,
____________________
embryonic
disk
folds
into
Cshaped
embryo
.
o
While
embryonic
folding
continues
,
this
results
in
a
____________________
or
narrowing
between
embryo
and
yolk
sac
,
creating
the
yolk
stalk
?
The
yolk
stalk
consists
of
____________________
ducts
:
?
____________________
/
____________________
duct
:
part
of
the
connecting
stalk
of
the
embryo
that
gives
rise
to
part
of
the
umbilical
cord
and
bladder
.
Obliterates
to
form
the
urachus
.
?
____________________
duct
/
____________________
duct
:
During
embryonic
folding
,
the
dorsal
aspect
of
yolk
sac
(
vitelline
duct
)
is
incorporated
into
the
embryo
,
developing
the
foregut
,
midgut
,
hindgut
,
and
forming
the
entire
____________________
tract
,
liver
,
biliary
tract
,
and
pancreas
o
The
yolk
stalk
and
____________________
are
brought
together
by
expanding
amnion
,
which
covers
the
three
structures
forming
the
____________________
cord
.