Are there other bones in the arm besides radius and ulna space between those two big bones?

There are a total of 3 bones in the arm, the humerus, the radius, and the ulna.

The humerus is the bone that connects the shoulder to the elbow and is the largest bone in the upper limb.

The radius and the ulna are the two bones of the forearm and run from the elbow to the wrist.

The space between the radius and ulna is called the interosseous membrane, filled with tissue that connects the two bones and allows for some movement between them.