The innermost of the three primary germ layers that form during early embryonic development, which eventually becomes the lining of the digestive and respiratory systems.
From Greek 'endo-' (within) + 'blastos' (bud, sprout). This embryological term refers to the 'inner budding layer' that forms during the earliest stages of animal development.
Your endoblast was one of the first parts of you to form as an embryo, and everything that digests your food and helps you breathe came from this single inner layer—talk about starting small!
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