College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What is the name of the medial bone in the forearm?

humerus
ulna
radius
tibia

The correct answer is: ulna

The medial bone in the forearm is known as the ulna. In anatomical terms, the forearm consists of two long bones: the radius and the ulna. The ulna is positioned on the side of the forearm opposite the thumb, making it the medial bone when considering the anatomical position, where the body stands facing forward with arms at the sides and palms facing forward. The ulna plays a crucial role in forming the elbow joint, articular surface for the humerus at the trochlea, and contributes to the wrist joint at the ulnar notch of the radius. Its structure allows for function such as significant load-bearing and providing structural integrity to the forearm. In contrast, the radius, which is the other bone in the forearm, is situated laterally (on the same side as the thumb) and is more involved in the rotation of the forearm. The humerus, on the other hand, is the bone of the upper arm, and the tibia is not part of the forearm; it is located in the lower leg. Understanding the positions and functions of these bones is essential for grasping the anatomy of the upper limb.