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n. Anatomy See ball-and-socket joint.

n. A ball-and-socket joint.

n. A ball and socket joint, or the kind of articulation represented by such a joint. See articulation.

n. In anatomy, a ball-and-socket joint; a kind of movable arthrosis or free articulation which consists in the socketing of a convex end of a bone in a concavity of another bone, forming a joint freely movable in every direction. The hip and shoulder are characteristic examples. Also enarthrodia.

n. a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone

"The bony surfaces would of themselves constitute an enarthrosis and allow of movement in all directions, were it not for the annular ligament, by which the head of the radius is bound to the radial notch of the ulna, and which prevents any separation of the two bones laterally."

enarthroses    articulation