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first rib

   Also found in: Wikipedia 0.01 sec.
first rib,
the highest rib of the thoracic cage. It moves about the axis of its neck, raising and lowering the sternum. First rib movement during quiet breathing is negligible, but under conditions of stress it can increase the anteroposterior diameter of the chest.


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Several cases of stress fractures of the first rib have also been reported as sports-related injury, such as baseball, tennis, soccer, ballet dancer, and weight lifting (Coris and Higgins, 2005; Matsumoto et al.
The cavity that exists between your first rib and your clavicle is filled with nerves, veins, and muscle When any of them become compressed, a condition called thoracic outlet syndrome (TOS) can develop The cavity that exists between your first rib and your clavicle is filled with nerves, veins, and muscle.
The one in a first embodiment includes first ribs whose tops are spaced apart from lattice members and second ribs having tops abutting on the lattice members and a smaller rib width than the first ribs.
 
 
 
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