The early stages of differentiation of the vascular bed in the ventricular wall of the human embryonic heart as seen in the electron microscope.
D002196:Capillaries / Q000166:cytology; D002454:Cell Differentiation; D002467:Cell Nucleus; D003331:Coronary Vessels / Q000196:embryology*; D003593:Cytoplasm; D003896:Desmosomes; D004912:Erythrocytes; D005347:Fibroblasts; D006321:Heart / Q000196:embryology*; D006352:Heart Ventricles / Q000098:blood supply; D006801:Humans; D008854:Microscopy, Electron; D009210:Myofibrils