The evolution of the human heart becomes increasingly defined by day 22, a stage where the embryonic cardiovascular system takes shape with distinct regions like the truncus arteriosus, bulbus cordis, primitive ventricle, and primitive atrium. This image illustrates the primitive heart tube as it begins to segment into these specialized areas, marking a crucial phase in establishing a functional circulatory system that supports the growing embryo.
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Explore the anatomical structure of the newborn skull from a superior view. Learn about fontanelles, sutures, and the importance of skull flexibility for birth and brain growth.
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