Elevation of the clavicle at the sternoclavicular joint involves osteokinematic motion of the clavicle in the ____________________ direction and arthrokinematic motion of the joint surface in the ____________________ direction
a. inferior, superior
b. inferior, inferior
c. superior, inferior
d. superior, superior
ANS: C
The sternoclavicular joint is a saddle joint with both concave and convex surfaces on each joint surface. In clavicular elevation, the convex surface of the clavicle moves on the concave surface of the manubrium, causing the osteokinematic and arthrokinematic motions to be in the opposite directions.
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