666
UNIT 4
Maintenance of the Body
18
Pulmonary valve
Aortic valve
Area of cutaway
Mitral valve
Tricuspid valve
Myocardium
Tricuspid
(right atrioventricular)
valve
(a)
Mitral
(left atrioventricular)
valve
Aortic
valve
Pulmonary
valve
Cardiac
skeleton
Anterior
(b)
Chordae tendineae attached
to tricuspid valve flap
Papillary
muscle
(c)
Mitral valve
Chordae
tendineae
Interventricular
septum
Myocardium
of left ventricle
Opening of inferior
vena cava
Tricuspid valve
Papillary
muscles
Myocardium
of right
ventricle
(d)
Figure 18.6
Heart valves.
(a)
Superior
view of the two sets of heart valves (atria re-
moved). The paired atrioventricular valves are
located between atria and ventricles; the two
semilunar valves are located at the junction
of the ventricles and the arteries issuing from
them.
(b)
Photograph of the heart valves,
superior view.
(c)
Photograph of the tricuspid
valve. This bottom-to-top view shows the
valve as seen from the right ventricle.
(d)
Coronal section of the heart. (For related
images, see
A Brief Atlas of the Human Body
,
Figures 58 and 60.)
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