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Why are the thoracic and sacral curves known as primary curvatures of the spine?

By blonderw Asked Sep 28 2008 12:04PM
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Answer 1 out of 2

by Roger the RoflMaster on Feb 25, 2009 at 10:51 am Permalink

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Because during birth, the fetal develops the thoracic and sacrum in the same position we are in now. When the newborn raises its head upright, that is a secondary curvature, to the cervical vertebrae.When the newborn stands upright, the lumbar vertebrae changes too.
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Answer 2 out of 2

by Regina on Oct 4, 2008 at 12:12 pm Permalink

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http://www.mreroh.com/.../...etal%20System.htm


some of the questions i've been trying to answer, i have found them here
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Why are the thoracic and sacral curves known as primary curvatures of the spine?

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