Ball and socket joint
allows rotational movement but prevents transtional movement to the member attached to it
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
changeExamples 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
change-
Hip -
Shoulder
References
change- ↑ "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.