Our focus here, on this
slide, is to understand
the topography of the lungs and you’ll need
to think about the superior topography or
limit of each lung versus its inferior limit.
So, first, let’s start with the superior limit
of the lung and we see the apex of the right
lung projecting above the clavicle.
We also see the apex of the left lung projecting
above the left clavicle. And if we take a
posterior view of the apices of the lungs,
they’ll have a vertebral level relative to
C7, the vertebra prominens. The distance above
the clavicle is about 2.5 cm, which would
be equivalent to 1 inch.
The inferior limits of the lungs are going
to depend along which line of axis we’re looking
at or viewing. And we will describe three
axes. One will be midclavicular. One will
be on the lateral side of the thoracic wall,
midaxillary. And then posteriorly, we’ll have
one that runs along either side of the vertebral
column and that’ll be a paravertebral vertical
axis. If we start with the midclavicular,
going to midaxillary, going to the paravertebral,
the inferior limits of the right lung and
the left lung will be at rib 6, midclavicular,
midaxillary. The lung will extend down to
rib 8 and then posteriorly, the inferior limit
of the right lung and the left lung will extend
down to the level of your 10th rib. So, it’s
6, 8, 10.