Friday, October 5, 2012

Sacro Spinalis

These last few muscles discussed (sacro spinalis, rectus abdominus, and the obliques) are the muscles that move the trunk.  We have so few muscles moving the trunk in comparison to the upper arm because the trunk has a much smaller range of motion.  It can basically bend forward, backward, side to side, and twist side to side.  We sacrifice range of motion for stability.

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