from The American Heritage® Dictionary of the English Language, 5th Edition.
noun The thin serous membrane, composed of endothelial tissue, that lines the interior of the heart.
from The Century Dictionary.
noun In anatomy, the lining of the heart, as distinguished from the pericardium, or investing membrane of that organ; the membrane forming the inner surface of the walls of the cardiac cavities, or this surface itself.
from the GNU version of the Collaborative International Dictionary of English.
noun (Anat.) The membrane lining the cavities of the heart.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
noun anatomy, cardiology A thin serous membrane that lines the interior of the heart.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun the membrane that lines the cavities of the heart and forms part of the heart valves
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[New Latin : endo– + Greek kardiā, heart; see kerd- in Indo-European roots.]
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Examples
The endocardium is a thin, smooth membrane which lines and gives the glistening appearance to the inner surface of the heart; it assists in forming the valves by its reduplications, and is continuous with the lining membrane of the large bloodvessels.
The inner surface of the heart is lined by a serous membrane, the endocardium, which is smooth and firmly adherent to the muscular structure of the heart.
In the Flesh we see present in section: the myocardium, the endocardium, the vagus nerve and also the left ventricle of the heart for the large thickness of the myocardium.
Secondly, metastases from the lung to the heart are usually the result of direct extension and almost always involve the outer pericardium, not the endocardium.
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