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. 2022 Nov 3;9(11):379. doi: 10.3390/jcdd9110379

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The embryonic heart tube of a HH13 chick stained with PbOAc. (A) Overview, micro-CT volume rendering: the red dotted line corresponds to the sectioning plane of (B,C) Virtual cross-section through the embryonic heart tube in the area of the primitive ventricle fixed at different phases in the heart cycle. (B) systole—the lumen is slit-shaped; (C) diastole—the lumen appears more oval in shape. At atrium, CJ cardiac jelly, endo endocardium, lu lumen, myo myocardium OFT outflow tract, pVe primitive ventricle; scale bar = 100 µm.