The trochlear notch (/ ˈ t r ɒ k l ɪər /), [1] also known as semilunar notch and greater sigmoid cavity, is a large depression in the upper extremity of the ulna that fits the trochlea of the humerus (the bone directly above the ulna in the arm) as part of the elbow joint.

2023年11月2日 · Trochlear notch of the ulna and the trochlea of the humerus; Head of the radius and the capitulum of the humerus; Note: The proximal radioulnar joint is found within same joint capsule of the elbow, but most resources consider it as a separate articulation.

The trochlear (semilunar) notch is the large concave area found on the anterosuperior aspect of the proximal part of ulna. It consists of two articular portions: —the proximal articular portion is found on the anterior aspect of the olecranon; —the distal articular portion is found on the superior aspect of the coronoid process.

…large C-shaped notch—the semilunar, or trochlear, notch—which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint. The projection that forms the upper border of this notch is called the olecranon process; it articulates behind the humerus in the olecranon fossa and may be felt…

2015年8月17日 · Trochlear notch is a deep notch facing anterior in the ulna’s thick proximal end. It is the articular surface that is covered with cartilage and it receives the trochlea of humerus— a pulley like structure.

2023年9月11日 · The rounded surfaces of the trochlea and capitulum of the humerus rotate against the concave surfaces of the trochlear notch of the ulna and head of the radius. At the elbow joint, the proximal ends of the radius and ulna articulate with each other at the proximal radioulnar joint.

The trochlear notch (semilunar notch, greater sigmoid cavity) is a large depression, formed by the olecranon and the coronoid process, and serving for articulation with the trochlea of the humerus.

In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.

The trochlear notch is a large, concave indentation located at the proximal end of the ulna, which articulates with the trochlea of the humerus to form the elbow joint. This structure allows for the wide range of motion necessary for forearm movement.

The trochlear notch is a “C”-shaped articular surface of the proximal ulna. There is a central ridge on the trochlear notch that articulates with the saddle-shaped trochlea of the humerus forming a hinge that makes up the largest part of the elbow joint.