What is the name of the joint between the radius and ulna?

The joint between the radius and ulna is called the radioulnar joint. This joint is crucial for the forearm's rotational movement, allowing for actions such as pronation and supination, which are essential for daily activities and functional tasks. There are two radioulnar joints in the forearm: the proximal radioulnar joint near the elbow and the distal radioulnar joint near the wrist. Each of these joints plays a key role in enabling the radius and ulna to work together smoothly, facilitating movement of the forearm and hand.

The other choices represent different anatomical joints: the humeroulnar joint connects the humerus to the ulna, the glenohumeral joint refers to the shoulder joint between the humerus and the glenoid cavity of the scapula, and the scapulothoracic joint is not a true anatomical joint but refers to the movement of the scapula over the thoracic rib cage. Each of these joints serves specific functions but does not refer to the radius and ulna connection.