Landmark · Skeletal system
Trochlear notch
Incisura trochlearis
- System
- Skeletal system
- Regions
- Upper limb
- Side
- Left and right
- Landmark on
- Ulna
DescriptionUnreviewed
The trochlear notch, 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.
It is formed by the olecranon and the coronoid process.
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.
Source: Wikipedia · Text licence: CC BY-SA 3.0 · This text comes from the source data and has not been reviewed by a person yet.
Names
- Latin
- Incisura trochlearis
- English
- Trochlear notch
- French
- Incisure trochléaire
- Spanish
- Incisura troclear
- Portuguese
- Incisusa troclear