The endocardial cushion is a specialized region of mesenchymal cells that will give rise to the heart septa and valves[GO]. Swellings of tissue present between the endocardial and myocardial cell layers that will give rise to the interstitial cells of the cardiac valves[ZFA].
GO graph seems to suggest this is an endothelium. WP: The endocardial cushions are thought to arise from a subset of endothelial cells that undergo epithelial to mesenchymal transformation, a process whereby these cells break cell-to-cell contacts and migrate into the cardiac jelly (towards to interior of the heart tube). Latest (2010-06-01) new def suggested for GO, added above. Note that EHDAA2 has a more detailed model which we may later adopt. JB: Patterning makes the cushions lay down connective tissue in three domains that force out the local endothelial lining and so the leaflets form
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class Information
relationship loss: develops_from endocardial ring (TAO:0005072)[TAO]
Swellings of tissue present between the endocardial and myocardial cell layers that will give rise to the interstitial cells of the cardiac valves.[TAO]
uberon
(Cardiac valve formation in vertebrates) In response to a myocardial signal, endocardial cells at chamber boundaries take on a mesenchymal character, delaminate and migrate into the cardiac jelly. There, they form an endocardial cushion that is later remodelled into a valve.[well established][VHOG]