Histologic
changes
____________________
with
aging
____________________
throughout
the
auditory
system
from
the
hair
cells
of
the
cochlea
____________________
the
auditory
cortex
in
the
temporal
lobe
of
the
brain
.
These
____________________
may
correlate
with
different
clinical
findings
and
auditory
test
results
,
depending
____________________
the
severity
of
the
changes
and
the
anatomic
level
____________________
which
they
occur
.
Over
the
past
50
years
some
brilliant
research
in
the
field
____________________
presbycusis
____________________
been
witnessed
,
____________________
elucidation
of
the
pathophysiology
of
presbycusis
is
still
incomplete
.
Many
researchers
have
____________________
the
causes
of
this
disease
.
Crowe
and
associates
,
Saxen
,
and
Gacek
and
Schuknecht
have
studied
histologic
changes
in
the
cochleae
of
human
ears
with
presbycusis
.
Gacek
and
Schuknecht
identified
4
sites
of
aging
in
the
cochlea
____________________
divided
presbycusis
into
4
types
____________________
on
these
sites
.
The
histologic
changes
are
correlated
approximately
with
symptoms
and
auditory
test
results
.
