https://doi.org/10.1351/goldbook.10490
Gelatinous substance, present between the endothelium and myocardium of the heart in early embryos, that develops into the connective tissue of the endocardium.
Gelatinous substance, present between the endothelium and myocardium of the heart in early embryos, that develops into the connective tissue of the endocardium.