Final answer:
The humeroulnar, humeroradial, and proximal radioulnar joints form part of the elbow joint, which is uniaxial and allows for movements such as flexion, extension, and rotation of the forearm.
Step-by-step explanation:
The humeroulnar, humeroradial, and proximal radioulnar joints are the three articulations present at the elbow joint. The humeroulnar joint is a uniaxial hi nge joint formed by the articulation between the trochlea of the humerus and the trochlear notch of the ulna. Additionally, the elbow includes the humeroradial joint, which involves the articulation between the capitulum of the humerus and the head of the radius, and the proximal radioulnar joint, a uniaxial pivot joint that allows for rotation of the radius during pronation and supination of the forearm. All three of these joints are enclosed within a single articular capsule. The elbow is a complex joint that also involves collateral ligaments for stability; the ulnar collateral ligament supports the medial side, while the radial collateral ligament supports the lateral side.