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. Author manuscript; available in PMC: 2018 Sep 30.
Published in final edited form as: Pediatr Cardiol. 2018 Mar 28;39(6):1082–1089. doi: 10.1007/s00246-018-1868-x

Figure 2. The monolayer of myocardium displays apical-basal polarity.

Figure 2.

Mouse embryonic heart tube at E9.5-E9.0 has a smooth inner surface and contains a monolayer myocardium and a monolayer endocardium. The monolayer myocardium displays transmural polarity with basement membrane inside the heart lumen. ?: The orientation of apical-basal polarity shows some controversy, as a group says the domain that abuts the heart lumen is the apical domain or basal domain by another group.