Mesoderm lOose -condenses day 17 3 columns Notochord Amniotic cavity Paraxial ntermediate Ectoderm mesoderm exoderm Intercellular Mesoderm Paraxial mesoderm Dorsal lateral (轴旁中胚层) ate -Intermediate mesoderm Parietal mesoderm (间介中胚层) mesoderm layer embryonic Lateral plate mesoderm (侧中胚层 c DMesoderm •Loose – condenses day 17 •3 columns –Paraxial mesoderm （轴旁中胚层） –Intermediate mesoderm （间介中胚层） –Lateral Plate mesoderm （侧中胚层）