- Trochlear notch
Infobox Bone
Name = Semilunar notch
Latin = incisura trochlearis ulnae, incisura semilunaris ulnae
GraySubject = 52
GrayPage = 215
Caption = Upper extremity of leftulna . Lateral aspect. (Semilunar notch visible at center top.)
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DorlandsPre = i_05
DorlandsSuf = 12447565
The semilunar notch of theulna (trochlear notch of ulna, greater sigmoid cavity) is a large depression, formed by theolecranon and thecoronoid process , and serving for articulation with thetrochlea of thehumerus .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.
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