Anatomy Lecture 13!
The Heart – Chapter 658-685. Email Copeland with any
-Outermost layer is the superﬁcial ﬁbrous pericardium, helps
to protect the heart and the cavity. Also anchors it in place!
-Prevents overﬁlling of the heart with blood, gives a limit of
how much blood can get into the heart – important function.
Without it there would be stretching of the tissue and then
-Serous ﬂuid and visceral pericardium allow for the heart to
work in a relatively friction free environment!
-Beneath that is a deep two-layer serious pericardium:
parietal and visceral layers, visceral layer is directly on top of
the heart muscle -Serous ﬂuid separates them
Myocardium – beneath the pericardium!
-Muscle layer forming the bulk of the mass of the heart,
comprised of cardiac muscle cells, striated!
-Provides support for big vessels and valves!
-Branching muscle cells arranged in bundles!
-Specialized structures within the cardiomyocytes allow for
the conduction of action potentials
Then Endocardium – endothelial layer of the inner
myocardial surface; continuous vessels leaving and entering