So, the heart itself is a very muscular tissue.
And because it is constantly working,
it requires a lot of energy to do its job.
So we must have a functional
blood supply to the heart itself.
This blood supply is referred to as the coronary circulation.
It is the shortest circulation in the body because
it starts at the heart and ends at the heart.
It is delivered to the heart when
the heart is in a relaxed state
and the way this works is that the left ventricle is
going to receive most of the coronary blood supply.
So in the coronary circulation, we
have what's known as coronary arteries.
Both left and right coronary arteries are
going to arise from the base of the aorta
and they are going to supply this arterial blood
or oxygenated blood directly to the heart's muscles.
It's going to encircle the heart and
what's known as the coronary sulcus
and the branching of these arteries is going to
vary among different individuals in the population.
These arteries also contain multiple
junctions or branches known as anastomoses.
These anastomoses are gonna provide
additional routes for the delivery of blood.
However, if there is an occlusion or
a blockage in our coronary arteries,
these anastomoses are not going to be
able to compensate fully for this blockage.
Out of the body's blood supply, the heart itself is
going to receive 120th or about 5% of that blood.
So on the heart, we have the left coronary artery
which is going to supply the interventricular septum.
It's also going to supply the anterior ventricular walls,
the left atrium and the posterior wall of the left ventricle.
The left coronary artery has two branches: the anterior
interventricular artery and the circumflex artery.
Because of the left side of the heart's function and
role in our body, blockage of these coronary arteries
are especially dangerous because the
left side of the heart has to work very hard
to pump blood to the rest of our bodies.
On the right side, we have the right coronary
artery which is going to supply the right atrium
and most of the right ventricle.
It too has two branches: the right marginal
artery and the posterior interventricular artery.
Along wth arteries, we also have coronary veins.
These are gonna be cardiac veins that are going to
collect the blood from the capillary beds in the heart.
The coronary sinus is then going to
empty that blood into the right atrium
and it is formed by the merging
of all these cardiac veins.
First, we have the great cardiac vein which
is found in the anterior interventricular sulcus,
the middle cardiac vein which is found
in the posterior interventricular sulcus,
and lastly we have a small cardiac vein that's gonna
be found from the inferior margin of the heart.
There are also several anterior cardiac
veins that are going to empty directly
into the right atrium instead of
going through the coronary sinus.