Question

multiple choice question
the outer wall of the pericardium is a sac called the ______.

○ serous pericardium
○ epicardium
○ fibrous pericardium

Explanation:

The pericardium has two main layers: the outer fibrous pericardium and the inner serous pericardium (which has two sub - layers). The epicardium is the outermost layer of the heart wall, not the outer wall of the pericardium. The outer wall of the pericardium is the fibrous pericardium.

Answer:

C. fibrous pericardium (Note: Assuming the options are labeled as A. serous pericardium, B. epicardium, C. fibrous pericardium based on standard multiple - choice question numbering for clarity, as the original options' numbering was not visible but the third option is fibrous pericardium which is correct)