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Superior vena cava
Portion of right
atrium derived
from sinus
venosus
Limbus
Musculi fossa ovalis
pectinati Fossa ovalis
Crista
terminalis Opening of
coronary sinus
Inferior Valve of the
vena cava coronary sinus
Valve of the inferior
vena cava
Fig.7.3
The interior of the right atrium

Right atrium

Left atrium
Fig.7.4
The interior of the left atrium and ventricle.
The arrow shows the direction of blood flow.
Note that blood flows over both surfaces
of the anterior cusp of the mitral valve

Pulmonary valve
(posterior, anterolateral
and anteromedial cusps)
Mitral Opening of right coronary artery
valve Aortic valve
(Anterior (right coronary) cusp,
Left posterior (left coronary) cusp,
right posterior (non-coronary) cusp)

Fig.7.5 Tricuspid valve
A section through the heart at the level of the valves.
Anterior Anterior
The aortic and pulmonary valves are closed and the
cusp Septal cusp
mitral and tricuspid valves open, as they would be Posterior cusp Posterior
during ventricular diastole cusp cusp

20 Thorax