What anatomy is labeled as letter A in the image below?

A) Capitulum
B) Lateral epicondyle of humerus
C) Trochlea
D) Coronoid process of ulna

Question

What anatomy is labeled as letter A in the image below?

A) Capitulum 
B) Lateral epicondyle of humerus 
C) Trochlea 
D) Coronoid process of ulna

Quizplus · Accepted Answer

The structure labeled A is the trochlea, which is a rounded structure on the distal end of the humerus that articulates with the ulna to form the elbow joint. The capitulum (A) is also on the distal end of the humerus, but is a smaller rounded structure that articulates with the head of the radius. The lateral epicondyle of the humerus (B) is a bony protrusion on the lateral side of the distal end of the humerus. The coronoid process of the ulna (D) is a projection on the proximal end of the ulna that articulates with the trochlea of the humerus to form the elbow joint.

What Anatomy Is Labeled as Letter a in the Image