So to finish off we're going to do a little bit of topographical anatomy.
We looked at the heart outside of the body,
now we're going to have a quick look at it in the body.
We don't have a dog for this, as you can probably tell, this is a horse.
So we have opened up the left hand side of the chest of the horse here.
And you can see here, you can see the heart sitting within the thorax.
So the lungs have been removed, this is a little bit of lungs remaining here.
And we're also peeled back this here which is the heart sac.
We've peeled that right back so you can see the heart, and
you might be able to recognize this structure we lifted earlier.
So this is your left auricle here, here's your pulmonary trunk coming out,
and then if you look up here, here is the aorta.
And as you can see in the body, it goes right up dorsally here
all the way along and out, and it will head towards the abdomen there.
So when we talked about the heart, if you remember,
I said we talked about the left and the right side of the heart.
But it doesn't sit perfectly left and right within the chest.
So on the left hand side of the heart, you've got this left ventricle, but
also this right ventricle.
And that means when you're auscultating the heart in the live animal,
you're actually listening to three out of the four valves on this side of the chest.
So on this side here, in this area here, if you put your stethoscope here,
you would be listening to the pulmonary valve.
If you move it up a little bit in this area, deep to here is the aortic valve.
And then if you move down here, you get over the left AV valve.
If you wanted to listen to right AV valve,
you would have to go on the right side of the chest.