Which of the following regarding the anatomy of the heart is true?
A) The aortic valve is tricuspid.
B) The ascending aorta is entirely outside the pericardial sac.
C) The left atrial appendage is identified readily by transthoracic echocardiography.
D) The pulmonary trunk lies anterior to the ascending aorta.
E) The right atrium is posterior to the left atrium.
Answer:
A) The aortic valve is tricuspid.
Discussion: The pulmonary trunk lies posterior to the aorta. The ascending aorta lies completely within the pericardium as does the pulmonary trunk. The left atrium is the most posterior chamber of the heart, the right atrium is just anterior and to the right of the left atrium. The left atrial appendage is not readily seen on transthoracic echocardiography and requires transoesophageal echocardiography
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