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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 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.
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 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.
19 Σεπ 2021 · Gross anatomy Osteology. 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; Articulations. proximal (elbow joint) olecranon: ulnatrochlear joint (elbow ...
25 Αυγ 2018 · The curved or crescent surface of the trochlear notch articulates with the trochlea of the humerus to form the hinge joint of the elbow. During extension of the arm, the olecranon inserts into the olecranon fossa, a deep recess or curve in the humerus, to keep the elbow from extending beyond its 180° range.
2 Νοε 2023 · Structures of the Elbow Joint. Articulating Surfaces. The elbow joint consists of two separate articulations: Trochlear notch of the ulna and the trochlea of the humerus. Head of the radius and the capitulum of the humerus.
