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Normal Curves
In a normal upright position the spine should have three neutral balanced curves. The neck is curved inward from back to front (lordotic), the thoracic spine curved outward (kyphotic), and the lumbar spine inward (lordotic). This is what is called a neutral balanced curve, in the front to back dimension. (See Th 1). Each part of the spine can actually reverse into the opposite direction providing us with the ability to configure ourselves for the purpose of getting into small spaces or express our self in dance/gymnastics.
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However for most functional activity in the upright position, a neutral balanced spine is what we want for taking the load of our body and whatever we are carrying, directly through solid bony support.
Movement
Without the rib cage to restrict it, the neck and low back are fairly free to move. There is generally less movement in the thoracic spine especially into side bending and rotational directions. The easiest movement available in the thoracic spine is flexion or rounding. If we sit without good muscular support acting around the whole spine, gravity causes increased rounding of the thoracic spine.
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