What is the name of the structure connecting the radius and ulna?

What is the name of the structure connecting the radius and ulna?

• A. Interosseous membrane
• B. Interosseous ligament
• C. Ulnar collateral ligament
• D. Radial nerve

Answer: (A)

The structure that connects the radius and ulna along their lengths is the interosseous membrane. This broad fibrous sheet runs between the two bones, attaching along the interosseous borders, and it keeps the radius and ulna aligned while still allowing forearm rotation. It also helps transmit load from the hand up through the radius to the ulna when you bear weight, stabilizing the forearm during movement and serving as a site for muscle attachments. Other options don’t fit because they refer to different structures: the interosseous ligament isn’t the standard name for this connecting sheet; the ulnar collateral ligament is a ligament of the elbow between the ulna and humerus; and the radial nerve is a nerve that travels around the arm, not a connection between the two forearm bones.

The structure that connects the radius and ulna along their lengths is the interosseous membrane. This broad fibrous sheet runs between the two bones, attaching along the interosseous borders, and it keeps the radius and ulna aligned while still allowing forearm rotation. It also helps transmit load from the hand up through the radius to the ulna when you bear weight, stabilizing the forearm during movement and serving as a site for muscle attachments.

Other options don’t fit because they refer to different structures: the interosseous ligament isn’t the standard name for this connecting sheet; the ulnar collateral ligament is a ligament of the elbow between the ulna and humerus; and the radial nerve is a nerve that travels around the arm, not a connection between the two forearm bones.