Ball-and-socket joint
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The ball-and-socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. The distal bone is capable of motion around an indefinite number of axes, which have one common center. This enables the joint to move in many directions.
An enarthrosis is a special kind of spheroidal joint in which the socket covers the sphere beyond its equator.[1]
Examples of joints
Examples of this form of articulation are found in the hip, where the round head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis; and in the shoulder joint, where the rounded upper extremity of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade.[2] (The shoulder also includes a sternoclavicular joint.)
Ball and Socket Joint Animation
Diagrams
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Hip
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Shoulder
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Details of hip joint. Template:Ordered list
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References
Public domain This article incorporates text in the public domain from Template:Wikidatathe 20th edition of Gray's Anatomy (1918) Template:Main other Template:Reflist
External links
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- ↑ Platzer, Werner (2008) Color Atlas of Human Anatomy, Volume 1, p.28
- ↑ And the phalanges (toes, fingers). Introduction to Joints: Synovial Joints - Ball and Socket Joints Template:Webarchive