ABSTRACT
At birth, the majority of the vertebral column is curved, with its concavity facing forward. As development occurs, and the child starts to lift its head and begins to walk, additional curvatures develop with the spine in response to these activities. The anterior concavity is maintained in the thoracic and sacro-coccygeal regions, hence they are given the name primary curves. The cervical and lumbar regions become convex anteriorly. These are the secondary curves.
