In the upper
part we can see
the opening of
the
superior vena
cava.
The portion of
the left
ventricle that
remains
below the
aortic orifice
is called the
aortic
vestibule
or arterial
chamber and its
walls are
smooth.
In the
anterolateral
part of the
right atrium
there is a
small recess
that extends
the atrium
forward and
out, it is the
atrial
appendage.
this orifice
also has a
small valve,
the
coronary sinus
valve or valve
of Thebesio.
right atrium is
Cavity is the
first to be
reached by
carboxygenated
blood from the
general
circulation.
Together they
form a kind of
funnel, with
base in the
ventricular
cavity and apex
in
the pulmonary
valve
On the external
wall, the
atrial surface
presents
numerous
rugae formed by
the pectineus
muscles.
Anteriorly is
the right
atrioventricula
r orifice, with
the valve
tricuspid (this
valve will be
discussed
later).
Internal
anatomy of
the heart