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This Concept Map, created with IHMC CmapTools, has information related to: Block 1 Case 1, endochondral ossification ???? notochord induces aggregation, fuse ???? marignal cells split off to form neural crest, differentiate into cartillage ???? through chondrification centers, sclerotomes ???? axial skeleton (vertebra), Paraxial mesoderm forms somites ???? myotomes, Paraxial mesoderm forms somites ???? dermatomes, cells migrate cephalically from primitive node ???? condense to form notochord, differentiate into cartillage ???? split into 2 unequal parts, split into 2 unequal parts ???? allows growth of spinal nerves staight to myotomes, cells migrate cephalically from primitive node ???? in hypoblast, axial skeleton (vertebra) ???? endochondral ossification, condense to form notochord ???? cranial to caudal, fuse day 21 Paraxial mesoderm forms somites, fuse day 26 anterior neuropore closes, neural folds elevate ???? fuse, Paraxial mesoderm forms somites ???? paired (42-44), fuse ???? from center out, condense to form notochord day 18 Induces Neurulation, Induces Neurulation days 15 - 23 formation of neural tube and neural crest cells, Induces Neurulation ???? neural folds elevate