will help transmit structures between the
thoracic and abdominal cavities.
Before we take a look at our next slide on
the arterial supply of the diaphragm, there’s
a key take-home message here. There are several
arteries that supply the diaphragm and each
one of these arteries will have, as a part
of its naming system, phrenic. Any time you
see the word phrenic,
you’re gonna associate that with the
diaphragm. So, let’s take a look at the
The first one here that we see in bold is
the musculophrenic. So, there is the suffix
phrenic. So, if there’s phrenic in its name,
it’s going to the diaphragm in part. So,
if we take a look at where that is, here’s
our internal thoracic artery. We also have
one over here. But, what's follow it here is that
would be the right internal thoracic artery.
And right at this location, it branches, it
bifurcates. And there's one that courses out
laterally, is referred to as the musculophrenic.
So, there will be phrenic branches to help
supply the diaphragm.
The next one in this list that is now in bold
is the pericardicophrenic artery. This is
also a branch of the internal thoracic artery.
And again, phrenic is in its name. Here’s
the internal thoracic artery coming downward
here. And then here’s this branch, this
small branch that courses down along the lateral
margin of the fibrous pericardium, joins
the phrenic nerve and then supplies branches
to the diaphragm. This is the pericardicophrenic
artery helping to supply the pericardium here
and then it will terminate in the diaphragm.
We also have superior phrenic arteries.
Do not have a figure to highlight or illustrate
those for you, but these are the last branches
of the thoracic aorta before it passes through
the aortic hiatus to become the abdominal
aorta. But, again, there is phrenic in the
And then the last set of arteries would be
our inferior phrenic arteries. These are the
first branches of the abdominal aorta. And
we can highlight those for you in this illustration.
Here’s the right one and then here is the
left one. So, they’ll help to supply the
inferior surface of the diaphragm. Again,
each one has phrenic in the name.
Venous drainage is a little bit different,
but again, it does kind of share some similar
nomenclature here. But, any of the veins draining
the diaphragm will have phrenic in their name.
So, we’ll have musculophrenic. And so, we
see the musculophrenic vein here in blue helping
to drain the diaphragm. Here we would have,
following the pericardicophrenic artery,
we would have its vein. And we see a portion
of the vein coming down here. We kind of lose
it as we get closer to the pericardium in
the diaphragm. And then we have inferior phrenic
veins. See a couple of them here joining
together and then that common inferior phrenic
vein empties into the inferior vena cava.
So, again, phrenic in the name of veins draining