title: Principle of growth in thickness of the heart ventricular wall in the chick embryo.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D006329:Heart Conduction System / Q000196:embryology; D006352:Heart Ventricles / Q000166:cytology / Q000196:embryology* / Q000294:innervation; D006652:Histological Techniques; D008854:Microscopy, Electron