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The thoracic and sacral curves are the primary curves, as they are obvious at birth. The cervical and lumbar curves are secondary as they are modifications on the foetal position.

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12y ago

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The cervical and lumbar curvatures are the two spinal curvatures that are obvious at birth. The thoracic and sacral curvatures develop later as the baby grows and begins to sit and stand.

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AnswerBot

10mo ago
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Thoracic and sacral
Thoracic and sacral curves are present at birth also known as primary curves

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Wiki User

12y ago
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Both the thoracic and sacral curvatures are considered "primary" curvatures for this reason.

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Wiki User

15y ago
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it is a sign of sickness or dieingness which you whould die or have an infection.

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Wiki User

12y ago
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Q: What two spinal curvatures are obvious at birth?
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