Diagram showing developmental stages of the chicken embryo heart, with labeled cross-sections and ventral views from stage HH6 to HH14. Coloured regions identify anatomical structures such as the paraxial and lateral head mesoderm, neural plate, neural tube, and early and late second heart field, illustrating tissue movements and the continuum between first and second heart fields during heart formation.
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Heart cells in chick embryos emerge from a continuous field, not separate regions. Incorporation of cells into the heart depends on cell position, morphogenetic movements and break-down of tissue bridges.
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