Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed
A. Rhesus monkey, Helly's fluid, H. & E., 5 x.
B. Human, Helly's fluid, phosphotungstic acid, hematoxylin stain, 7
x.
In A, the right and left ventricular cavities are shown in cross section. Note the thick wall of the left ventricle and the muscular interventricular septum separating the two cavities. In this septum courses the impulse-conducting tissue, i.e., the Purkinje fibers. Note the different orientation of muscle bundles in the myocardium.
In B, the thick left ventricular myocardium is shown separated from the epicardium by the subepicardial space filled with blood vessels and connective tissue containing fat. The epicardium is the visceral layer of the pericardial sac in which the heart is located. It is covered by a single layer of mesothelial cells.
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