• Notochord forms
• Sclerotome cells (paraxial mesoderm) surround notochord
• Form mesenchymal vertebral column

• Caudal half of one sclerotome and cranial half of the next, forms one vertebral mesenchyme, which goes through endochondral ossification  to form bone
• Notochord regresses in regions of vertebral body
• Notochord enlarges between the bodies to form nucleus pulposus

Each vertebral body gives 3 processes:

• 2 dorsal process – unite to form spinous process
• 2 lateral process – in cervical region, unites with coastal process to form foramen transversarium. In thoracic region forms transverse process
• 2 coastal process – in thoracic region elongates to form ribs