Trochlear notch

From Wikipedia, the free encyclopedia

Bone: Semilunar notch
Upper extremity of left ulna. Lateral aspect. (Semilunar notch visible at center top.)
Latin incisura trochlearis ulnae, incisura semilunaris ulnae
Gray's subject #52 215
Dorlands
/ Elsevier    		 i_05/12447565

The semilunar notch of the ulna (trochlear notch of ulna, 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.

About the middle of either side of this notch is an indentation, which contracts it somewhat, and indicates the junction of the olecranon and the coronoid process.

The notch is concave from above downward, and divided into a medial and a lateral portion by a smooth ridge running from the summit of the olecranon to the tip of the coronoid process.

The medial portion is the larger, and is slightly concave transversely; the lateral is convex above, slightly concave below.

[edit] External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e
Bones of upper limbs
Pectoral girdle, clavicle
Scapula
Humerus
Forearm
Hand


 This musculoskeletal system article is a stub. You can help Wikipedia by expanding it.
Languages