Definition of Eustachian
Eu`sta´chi`an
a.
1.
(Anat.)
Discovered
by
Eustachius
.
Eustachian catheter
a
tubular
instrument
to
be
introduced
into
the
Eustachian
tube
so
as
to
allow
of
inflation
of
the
middle
ear
through
the
nose
or
mouth
.
Eustrachian tube
(Anat.)
a
passage
from
the
tympanum
of
the
ear
to
the
pharynx
.
See
Ear
.
Eustachian valve
(Anat.)
a
crescent-shaped
fold
of
the
lining
membrane
of
the
heart
at
the
entrance
of
the
vena
cava
inferior
.
It
directs
the
blood
towards
the
left
auricle
in
the
fetus
,
but
is
rudimentary
and
functionless
in
the
adult
.
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