Now the valves of the heart ? the cardiac valves.
We have valves that are located between the
atria and the ventricles. We?ll also have
valves, as we?ll see in the next slide,
between the ventricles and the great arteries
that issue from the ventricles.
But I?ll stop here. Our focus here is on
the two valves between the atria and the ventricles.
This is the right atrioventricular valve here.
It has three cusps: one, two, three. Hence
another name for this valve is the tricuspid
valve. And we can name these cusps. And when
we name them, we?ll have an anterior cusp,
a posterior cusp and then a septal cusp as
it lies towards the interventricular septum separating
the right ventricle from the left ventricle.
Over here, we have the left atrioventricular
valve between the left atrium and the left
ventricle. It has two additional names. One
of those is bicuspid ? because we have two
cusps: an anterior cusp and a posterior cusp.
And a third name that?s attached to this
particular valve is mitral. And the medical
lexicon tends to use mitral more commonly.
Now let?s take a look at the valves that
are between the ventricles and the great arteries
that issue from them.
Here we can see the two valves at this level
and this level. If we start here with the
valve set that?s most anterior, here we?re
looking at the valve located between the right
ventricle and the pulmonary trunk leaving
the right ventricle. So this is receiving
blood that will be delivered to the lungs.
The pulmonic valve or semilunar valve has
three cusps and they?re named: this is the
anterior one, here?s the right one and here?s
the left one. So the right and left lie more
posterior than the anterior. And then if we
look here, this profile is demonstrating the
valve that exist between the left ventricle
and the aorta. This is the aortic semilunar
valve. And it has three cusps which can be
named: this is the right one, this is the
left one and this one is the posterior one.
What we cannot appreciate in this view is
that the right and left cusps right above
them, there will be orifices or ostia that
will lead to the coronary arteries. So the
right coronary artery would issue right above
this planar section, the left right above
this planar section. So these are coronary
cusps. And the one behind here or posterior
does not issue a coronary artery. So it?s
a non-coronary-related cusp. So that leads