english: It begins as a straight tube along the center of the embryo, but when the embryo  is around three weeks old, the tube starts to bend into a c-shape and rotate towards  the right side of the body.
non_english: Začne se kot ravna cev v centru zarodka, a ko je zarodek star približno tri tedne, se cev ukrivi v obliko črke C in se obrne proti desni strani telesa.