Interior heart Apex Interventricular septum Right atrium Left auricular appendage Right auricular appendage Tricuspid valve Left ventricle Superior vena cava Pulmonary artery Ascending branch of aorta Papillary muscles Aortic arch Right ventricle

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A Apex of the heart

B Interventricular septum

I Right auricle (atrium)

a Right auricular appendage (auricle)

b Left auricular appendage (auricle)

III Right Ventricle

IV Left Ventricle

c Superior vena cava

e Triscupid valve

f Pulmonary artery

i Aorta

2 Papillary muscles

3 Ascending branch of aorta

7 Aortic arch