The ball and socket joints (or spheroid joints ) are a type of synovial joint in which a spherical surface of one round bone fits with a depression like another bone cup. The distal bone is capable of moving around an infinite number of axes, which has a common center. This allows the bone to move in many places (almost all directions).
An enarthrosis is a special type of spheroidal joint where the socket covers the ball beyond the equator.
Video Ball and socket joint
Example
Examples of this articulation form are found in the hip, where the thighbone head (ball) is located inside a cup such as the pelvic acetabulum (socket), and in the glenohumeral joint of the shoulder, in which the humerus round head (ball) is located in the glenoid fossa such as the cup (socket ) of the shoulder blade. Shoulders include sternoclavicular articulation joints.
Maps Ball and socket joint
References
This article combines text in the public domain of page 287 of the 20th edition of Gray's Anatomy (1918)
Source of the article : Wikipedia
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