title: Positional variations of the heart and its component chambers.
mesh_terms: D003914:Dextrocardia; D006321:Heart; D006325:Heart Atria; D006330:Heart Defects, Congenital; D006352:Heart Ventricles; D006801:Humans; D007979:Levocardia; D012857:Situs Inversus; D009626:Terminology as Topic