Find the word definition

Crossword clues for endocardium

The Collaborative International Dictionary

Endocardium \En`do*car"di*um\, n. [NL., fr. Gr. 'e`ndon within + kardi`a heart.] (Anat.) The membrane lining the cavities of the heart.


n. (context anatomy cardiology English) A thin serous membrane that lines the interior of the heart.

  1. n. the membrane that lines the cavities of the heart and forms part of the heart valves

  2. [also: endocardia (pl)]


The endocardium is the innermost layer of tissue that lines the chambers of the heart. Its cells are embryologically and biologically similar to the endothelial cells that line blood vessels. The endocardium also provides protection to the valves and heart chambers.

The endocardium underlies the much more voluminous myocardium, the muscular tissue responsible for the contraction of the heart. The outer layer of the heart is termed epicardium and the heart is surrounded by a small amount of fluid enclosed by a fibrous sac called the pericardium.