Neural crest cells: Miniature electric muscles that colonize embryonic organs

Neural crest cells are a population of stem cells that invade the embryo in early development. They play a big role in what you look like: the pigments of your eyes, of your skin, and the bone structure of your face are all neural crests. Inside your body, the neural crest will form the myelin sheath of your peripheral nervous system and the entire nervous system of your intestine, the so-called "second brain."