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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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