The right border is formed by the right atrium (Figure III-2-I4). The left ventricle and the auricle of the left atrium form the left border.
The superior border is formed by the right and left auricles plus the conus arteriosus of the right ventricle.
The apex is the tip of the left ventricle.
The base is opposite the apex, formed mainly by the surface where the pulmonary veins enter the heart (left atrium) and by part of the right atrium.
The anterior wall is formed primarily by the right ventricle.
The posterior wall is formed by the left atrium.
The diaphragmatic wall is formed primarily by the left ventricle.
Figure 111-2-14. Sternocostal View of the Heart ventricle
Figure 111-2-14. Sternocostal View of the Heart
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