Ball and socket joint
A ball and socket joint (enarthrosis, spheroidal joint) is a joint in which the ball-shaped surface of a bone fits into the cup-like indentation of another bone. This type of joint allows the bone to move in a 360° angle—with more freedom than other joints.[1]
| Ball and socket joint | |
|---|---|
 1: Ball and socket joint; 2: Condyloid joint (Ellipsoid); 3: Saddle joint; 4 Hinge joint; 5: Pivot joint; | |
 Capsule of shoulder-joint (distended). Anterior aspect. | |
| Identifiers | |
| TA | A03.0.00.050 |
| FMA | 75301 |
| Anatomical terminology | |
Examples
Examples of this type of joint occur:
- in the hip, where the rounded head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis.
- in the glenohumeral joint of the shoulder, where the rounded head of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade.[2]
Other images
Hip- Shoulder
References
- "Ball-and-socket joint". Encyclopædia Britannica. Encyclopædia Britannica Online. Retrieved 10 March 2011.
- "Synovial Joints - Ball and Socket Joints". University of Michigan. Archived from the original on 10 March 2011. Retrieved 10 March 2011.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.