The document discusses the anatomy and positioning of the heart. It notes that the heart rotates 45 degrees during development, with two thirds of the right atrium and right ventricle facing anteriorly and two thirds of the left ventricle and most of the left atrium facing posteriorly. The left atrium forms most of the posterior aspect of the heart and most of the base. The right ventricle forms most of the anterior aspect, covering most of the left heart in front.

1. 280–340 g in males.
230–280 g in females.
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7.  The heart rotates 45 degrees
during development.
 Two thirds of RA and RV face
anteriorly.
 Two thirds of LV and most of LA
face posteriorly.
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10.  Lies behind the RA.
 Hidden by the ascending aorta and
pulmonary trunk.
 X-ray chest
 Small part of the left appendage
forms part of the left heart border.
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12.  RV - forms most of the
anterior aspect.
 Most of the left heart is
posterior.
 Covered in front by the right
heart.
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13.  Upper border of the heart
 Great vessels are attached.
 LA
 Forms most of the base of the heart.
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15.  Left atrium - forms most of the posterior aspect of the
heart.
 Enlarged LA
 May compress the esophagus
 Produce dysphagia
 Thrombi in the LA
 Transesophageal echocardiography.
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