FIGURE 3.
The heart wall structure includes the endocardium, epicardium, and myocardium. Reprinted with permission from Reference 89
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.