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Am J Dis Child. 1920;19(2):148-166. doi:10.1001/archpedi.1920.01910200064009.
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ANATOMY  Significance of Striations in Muscle.—Lewis,1 in some studies on the cells of heart muscle from very young chick embryos, arrives at some conclusions that are of far reaching application. She finds it possible to study with satisfaction the living cells of heart muscle from embryos of ten myotomes. In these cells she finds that complete cross striations are present, and much earlier than has been supposed by other observers. Cross striations are present, but not fibrils. The cross striations are very thin bands on the surface of the cell. They extend across the cell and never appear as narrow threads or fibrils. Fixation of the cell causes the formation of the surface layer into fibrils on which the cross striations are drawn together into deeper bundles, and then become evident as sharply marked structures. In places where the pull on the surfaces of the cell is such


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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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