In addition, the heart will project various
surfaces and it also has a base in the heart
wall and an apex. Here we?re
going to focus on the various surfaces of
the heart. And the bold items that you see
here are the ones that we?re going to highlight
on this slide. And then we?ll identify the
diaphragmatic surface and what forms that
surface. But first the sternocostal surface
or anterior surface.
So everything we see here represents that
anterior perspective or view point. And the
anterior surface of the heart will be formed
by the right atrium that we see here. We have
the right ventricle, which is to the left
to the anterior interventricular sulcus. And
then we have a portion of the left ventricle
that in this image lies to the right of the
anterior interventricular sulcus. And what
we cannot see real well is we have the left
auricle, that appendage that?s associated
with the left atrium. So those are the components
that will form the anterior or sternocostal
The right pulmonary surface is the surface
of the heart that faces the right lung. It
is formed primarily by the right atrium, that
we see right along here. That faces the right
lung. We also have a left pulmonary surface
that would face the left lung. It?s formed
primarily by the left ventricle with a contribution
from the left atrium.
Now let?s take a look at our next slide
so we can focus in on the diaphragmatic surface
of the heart. And the diaphragmatic surface
of the heart is going to be formed primarily
by your two ventricles that we see down here.
Here?s your right ventricle and then your left ventricle.
The base of the heart is that area of the
heart that?s going to receive the pulmonary
veins and the superior and inferior vena cava.
So that would be this area right in through
here. And within this area, we have portions
of the atria that are receiving these venous
structures ? all 6 venous structures that
constitute the veins of the great vessels.
The apex of the heart is directed away from
the base of the heart and, in most individuals,
that will project toward the left of the midline.
The apex is shown right here. It is formed
by the left ventricle and the left ventricle
alone. The apex resides typically 7 to 9 cm
to the left of the midline within the fifth
intercostal space. And that would be one intercostal
space below the location of the nipple, which
resides in the fourth. So one space below,
in the firth intercostal space you?ll find
the apex of the heart.