Answer to Plato and Aristotle

Correct answer is E. 1. Musculi pecitnati are present only in the atria of the heart. These are trabeculae carnae. 2. Given that the heart was in the anatomical position prior to slicing the ventricle, this represents the pulmonary trunk. 3. The left atrium is present at the back of the heart when in the anatomical position. Hence, these are pulmonary veins. 4. This structure represents the left auricle, not the right one. 5. Given the that the slice of the ventricle was made between the right and left cusps of the aorta, the papillary muscle is the anterior one.

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Answer to this question is based on material presented in lectures 12 of the Thorax Lecture Series.