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the thoraric cage is part of axial skeleton which is protects and covers our internal organs of our body. Wherein, the arm is part of appendicular skeleton that is freely movable joints and it's made of long bones. Only the pectoral girdle who can contributed why the arm and thorax had a relationships.

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14y ago
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Q: Why is there no problem the arm clearing the widest dimension of the thoracic cage?
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