Answer
Fig B.19.
The mark would be near where the styloid process of the radius ends.
Work Step by Step
The styloid process is at the medial aspect of the distal end of the radius. It is the point of insertion of the brachioradialis. muscle. The radius is frequently broke at the styloid process when one tries to break a fall with an outstretched arm ( colles or chauffer's fracture).
