The innermost of three main layers of cells in an embryo that develops into the digestive system and other internal organs.
From Greek 'endo-' meaning 'within' and 'derma' meaning 'skin.' This layer is called 'endoderm' because it's the inner 'skin' of the embryo, composed of cells that form internal structures.
Your digestive system, lungs, and thyroid gland all came from this one microscopic layer of cells in your embryo—it's wild that so many different organs arise from the same starting material!
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