During elbow extension from 90 ° flexion at the humeroradial joint, the radial head rolls in a(n) ____________________ direction and glides in a(n) ____________________ direction on the capitulum at the humeroradial joint
a. anterior/cephalic, posterior/inferior
b. posterior/caudal, posterior/inferior
c. anterior/cephalic, anterior/inferior
d. posterior/caudal, anterior/inferior
ANS: B
The shallow concave radial head articulates with the larger convex capitulum. This would constitute a concave on convex joint articular, and so the role and glide of the joint surface would occur in the same direction.
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