The
auricle
is
composed
of
elastic
cartilage
with
the
____________________
skin
attached
directly
to
the
perichondrium
.
It
____________________
to
form
during
week
6
of
gestation
through
consolidation
of
____________________
of
the
mesoderm
of
the
first
and
second
branchial
arches
,
giving
rise
to
the
His
hillocks
.
The
____________________
three
hillocks
are
derived
from
the
first
arch
,
the
second
three
from
the
____________________
arch
.
The
auricle
reaches
adult
shape
____________________
the
week
20
of
gestation
,
but
the
adult
size
is
not
reached
____________________
the
age
of
9
years
.
The
EAC
begins
to
form
____________________
week
8
of
gestation
,
when
the
surface
ectoderm
of
the
first
pharyngeal
groove
thickens
and
grows
toward
the
middle
____________________
.
This
core
of
tissue
begins
to
resorb
by
week
21
of
gestation
to
____________________
a
channel
that
is
complete
by
week
28
.
The
canal
reaches
adult
size
by
the
____________________
of
9
years
and
ossifies
completely
by
the
age
of
3
____________________
.
The
EAC
is
related
to
the
mandibular
fossa
anteriorly
,
the
____________________
air
cells
posteriorly
,
the
middle
cranial
fossa
superiorly
,
and
the
parotid
____________________
inferiorly
.
