This animation traces early cardiogenesis, showing how cardiac progenitor cells arise in the epiblast near the cranial end of the primitive streak and migrate through it into the lateral plate mesoderm. It highlights formation of the horseshoe-shaped primary heart field cranial to the neural folds and clarifies which structures it forms, including parts of the atria and the entire left ventricle. Useful for first-year MBBS students building a visual foundation in embryonic heart development.
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The vascular system appears in the middle of the third week, when the embryo is no longer able to satisfy its nutritional requirements by diffusion alone. Progenitor heart cells lie in the epi-blast, immediately adjacent to the cranial end of the primitive streak. From there, they migrate through the streak and into the visceral layer of lateral plate mesoderm where some form a horseshoe-shaped cluster of cells called the primary heart field (PHF) cranial to the neural folds (Fig. 13.1). These cells form portions of the some portions atria and entire left ventricles Audience: First year mbbs student struggling embryology