Question

question 32

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 curling of the fingers
b the rotational motion of the forearm
c the hyper extension of the forearm
d the hinge like motion of the forearm

Explanation:

Identify the articulating structures

Using the Pivot Joint knowledge point, the cup-like surface of the radial head articulates with the rounded capitulum of the humerus.

Determine the joint function

Using the Anatomical Movements knowledge point, this structural arrangement allows the radius to spin during pronation and supination.

Match with the correct option

This spinning movement directly enables the rotational motion of the forearm.

Answer:

• (A) the curling of the fingers
• (B) the rotational motion of the forearm (Correct answer)
• (C) the hyper extension of the forearm
• (D) the hinge like motion of the forearm