All this is true regarding pericardium, EXCEPT (find the wrong answer):

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Question restatement: All this is true regarding pericardium, EXCEPT (find the wrong answer).
Option 1: 'The parietal pericardium is one mesothelial layer of fluid-producing cells' This reflects that the parietal layer of the serous pericardium is a single mesothelial layer producing pericardial fluid. This is generally correct, as the serous pericardium comprises a parietal layer with mesothelial cells, and its fluid reduces friction.
Option 2: 'Pericardial recesses are the parietal and visceral layers of serous pericardium are continuous at the roots of the great vessels' This statement describes how the parietal and visceral layers are continuous around the roots of the great vessels, creating pericardial reflections and recesses. In anatomy, the serous pericardium forms reflections at the vessels, which is consistent with this description, so this is true.
Option 3: 'The transverse sinus under the pulmonary artery' Here, the exact location of the transverse sinus is being described. The transverse sinus is a space behind the ascending aorta and pulmonary trunk, between the arterial trunks and the superior vena cava/heart bases, not specifically 'under the pulmonary artery.' The phrasing 'under the pulmonary artery' misplaces its location; thus this statement is incorrect.
Option 4: 'The oblique sinus is between the pulmonary veins' The oblique sinus is a pericardial cul-de-sac located posterior to the left atrium and bounded by the four pulmonary veins; it is indeed the area between the pulmonary veins. This is a true descriptor.
Summary of reasoning: Options 1, 2, and 4 describe established features of the parietal and visceral layers, recesses, and the oblique sinus accurately, whereas option 3 gives an inaccurate localization of the transverse sinus, labeling it as under the pulmonary artery. This makes option 3 the incorrect statement.

APBME4650_001_2025_3 - ANATOMY FOR PHYSICISTS & ENGR Combined Chest and Abdomen

All this is true regarding pericardium, EXCEPT (find the wrong answer):

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