|ball-and-socket joint or ball joint|
|1.||a coupling between two rods, tubes, etc, that consists of a spherical part fitting into a spherical socket, allowing free movement within a specific conical volume|
|2.||anatomy Also called: multiaxial joint a bony joint, such as the hip joint, in which a rounded head fits into a rounded cavity, allowing a wide range of movement|
|ball joint or ball joint|
ball-and-socket joint n.
A multiaxial joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone, as in the hip joint. Also called cotyloid joint, enarthrodial joint, enarthrosis, spheroid joint.
|ball-and-socket joint (bôl'ən-sŏk'ĭt) Pronunciation Key
in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint. It is most highly developed in the large shoulder and hip joints of mammals, including humans, in which it provides swing for the arms and legs in various directions and also spin of those limbs upon the more stationary bones
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