Which bone forms the elbow joint with the humerus?

Which bone forms the elbow joint with the humerus?

• A. Ulna
• B. Radius
• C. Scapula
• D. Carpals

Answer: (A)

The elbow joint is formed mainly by the connection between the humerus and the ulna. The trochlear notch of the ulna hooks around the trochlea of the humerus, creating the hinge that allows bending and straightening of the elbow. The radius also participates in elbow movements at other articulations (with the capitulum of the humerus and at the proximal radioulnar joint) to enable forearm rotation, but the primary articulation forming the elbow is with the ulna. The scapula forms the shoulder joint with the humerus, and the carpals are in the wrist, not the elbow.

The elbow joint is formed mainly by the connection between the humerus and the ulna. The trochlear notch of the ulna hooks around the trochlea of the humerus, creating the hinge that allows bending and straightening of the elbow. The radius also participates in elbow movements at other articulations (with the capitulum of the humerus and at the proximal radioulnar joint) to enable forearm rotation, but the primary articulation forming the elbow is with the ulna. The scapula forms the shoulder joint with the humerus, and the carpals are in the wrist, not the elbow.