The outer layer of cells in an early embryo that develops into the nervous system and skin.
From Greek 'ekto-' (outside) and 'blastos' (bud or sprout), literally meaning 'outer shoot,' referring to the outermost germinal layer in embryonic development.
The ectoblast is basically nature's first decision—within days of conception, embryos split into layers, and this outer one becomes your entire nervous system and skin, meaning you literally think with your ectoblast!
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