Key result
Human embryonic myocardial cells at 8 to 18 weeks of development exhibit abundant sarcoplasm, sparse randomly distributed myofibrils, and less pronounced sarcoplasmic reticulum compared to adults.
Authors
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Highlights immature ultrastructure in early myocardium; extends developmental anatomy but leaves open functional and clinical relevance.
Observational
Leak et al. (1964) conducted an observational in Human embryonic myocardial tissues. Ultrastructural examination vs. Adult myocardium was evaluated on Ultrastructural characteristics of myocardial cells. Human embryonic myocardial cells at 8 to 18 weeks of development exhibit abundant sarcoplasm, sparse randomly distributed myofibrils, and less pronounced sarcoplasmic reticulum compared to adults.
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