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. Author manuscript; available in PMC: 2024 Jul 1.
Published in final edited form as: J Physiol. 2023 Apr 9;601(13):2593–2619. doi: 10.1113/JP283792

Figure 1. Electron microscopy of fetal hearts.

Figure 1.

A, fetal hearts at 20 weeks of gestation, with some desmosomes forming at intercalated disc (arrows). Note scattered myofibrils. B, fetal heart at 30 weeks of gestation, with more abundant desmosomes at the intercalated disc and more densely packed myofibrils. Arrows indicate sarcoplasmic reticulum tubules at the Z-line, which were not present in the earlier period. Abbreviations: d, desmosomes; fa, fascia adherens; gj, gap junctions; mf, myofibrils. Scale bars: 0.53 μM. Adapted with permission from Kim et al. (1992).