An Electron Microscope Study of Embryonic Heart Muscle Cells Grown in Tissue Cultures

Cells in tissue cultures usually leave from the mass of tissue and migrate to the periphery of the medium where they may extend and flatten considerably. Under these conditions they have been widely used for the study of their inner structure under the light microscope, in vivo as well as in fixed and stained preparations. In the present paper some results will be given of an electron microscopic study of thin sections of such cells grown from explants of the heart muscle of chick embryos.