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The trochlear notch (/ ˈtrɒklɪər /), [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.
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.
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.
1 Οκτ 2024 · The proximal end of the ulna articulates with the trochlea of the humerus. To enable movement at the elbow joint, the ulna has a specialised structure, with bony prominences for muscle attachment. Important landmarks of the proximal ulna are the olecranon, coronoid process, trochlear notch, radial notch and the tuberosity of ulna:
19 Σεπ 2021 · Prominent features of the ulna include: proximal: olecranon, trochlear notch, coronoid process, radial notch (lateral), sublime tubercle (medial) shaft: ulnar tuberosity. distal: head, styloid process, fovea, groove for extensor carpi ulnaris.
2 Νοε 2023 · 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.
30 Οκτ 2023 · The proximal ulna is a large hook-shaped structure which articulates with the distal humerus and the head of the radius. It bears the olecranon, trochlear notch, coronoid process, radial notch, sublime tubercle and ulnar tuberosity.
