The proximal end of the radius illustrates the relationship of form and function.The cup-like surface of the radial head articulates with the rounded shape of the capitulum.This forms a joint that allows for ________.
A) the rotational motion of the forearm
B) the curling of the fingers
C) the hinge like motion of the forearm
D) the hyper extension of the forearm

Question

Quizplus · Accepted Answer

The cup-like surface of the radial head articulates with the rounded shape of the capitulum to form a pivot joint. This pivot joint allows for rotational motion of the forearm, which is necessary for activities such as turning a doorknob, unscrewing a jar lid, or using a screwdriver. Therefore, choice A, the rotational motion of the forearm, is the best choice. Choices B, C, and D are not correct because they describe motions that are not directly related to the joint formed by the proximal end of the radius and the ulna.

The Proximal End of the Radius Illustrates the Relationship of Form