The proximal end of the ulna illustrates the relationship of form and function.The rounded trochlear notch articulates with the hourglass shape of the trochlea.This forms a joint that allows for ________.
A) the curling of the fingers
B) the hyper extension of the forearm
C) the rotational motion of the forearm
D) the hinge like motion of the forearm

Question

Quizplus · Accepted Answer

The hourglass shape of the trochlea and the trochlear notch of the ulna form a hinge-like joint, which allows for the flexion and extension of the forearm, as well as limited supination and pronation (rotational motion). Therefore, the best choice is D - the hinge-like motion of the forearm. Choices A, B, and C do not accurately reflect the function of the ulna's proximal end.

The Proximal End of the Ulna Illustrates the Relationship of Form