cardiac mesenchymal cell
http://purl.obolibrary.org/obo/CL_0000569
A mesenchymal cell found in the developing heart and that develops into some part of the heart. These cells derive from intra- and extra-cardiac sources, including the endocardium, epicardium, neural crest, and second heart field. [ http://www.ncbi.nlm.nih.gov/pubmed/18816864 ]