The
____________________
____________________
protects
the
heart
and
lungs
.
It
consists
of
12
thoracic
____________________
,
twelve
pairs
of
____________________
,
and
____________________
.
The
sternum
is
an
____________________
bone
and
consists
of
the
____________________
,
which
is
the
superior
sternal
bone
.
The
____________________
or
middle
sternal
bone
extends
from
the
____________________
-
T9
.
The
____________________
____________________
is
the
____________________
sternal
bone
.
The
12
pairs
of
____________________
articulate
posteriorly
with
the
T1
-
____________________
thoracic
vertebrae
.
Ribs
1
-
____________________
attach
to
the
sternum
through
____________________
____________________
are
known
as
____________________
ribs
.
Ribs
8
-
____________________
are
known
as
____________________
ribs
.
Ribs
11
-
12
that
do
____________________
attach
to
the
sternum
are
know
as
____________________
ribs
.
The
1st
rib
is
short
,
broad
,
and
____________________
.
The
6th
rib
has
a
head
,
neck
and
____________________
.
The
12th
rib
is
a
short
____________________
bone
.
