Pediatricsbasic
Which description best represents the normal pericardium?
Answer
A two-layered sac with a potential space containing a small volume of serous fluid
Explanation
The **pericardium** is a relatively avascular fibrous sac surrounding the heart. It has visceral and parietal layers, with a potential space between them that normally contains a small amount of serous fluid. This arrangement allows the heart to move while the pericardium anchors it within the thorax and acts as a barrier to infection. The other options incorrectly describe its structure, contents, or extent. **Key takeaway:** The normal pericardial space is small and lubricated, not an empty or large fluid-filled cavity. **Glossary:** **Visceral pericardium**: the layer closely covering the heart. **Parietal pericardium**: the outer layer of the pericardial sac.
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