The posteriorly concave cervical and lumbar curvatures are sometimes called secondary curvatures.

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The posteriorly concave cervical and lumbar curvatures are indeed sometimes called secondary curvatures, as opposed to the primary curvatures (anteriorly convex thoracic and sacral curvatures) that are present at birth. These secondary curvatures develop as a person learns to lift their head and walk upright, placing weight on their feet and shifting their center of gravity forward.

The Posteriorly Concave Cervical and Lumbar Curvatures Are Sometimes Called