Elbow

[Sax. elboga, elnboga - elne, an ell, and bog a, any thing curved, a bow; Du. elleboog; Ger, elbogen. See ELL and Bow. The bend of the arm, or outer angle made by the bend of the arm; any flexure or angle; the obtuse angle of a wall, building, or road. ( Anat .) The joint of the arm formed by the lower end of the humerus and the upper end of the radius and ulna. The lower end of the humerus is received into the hollow of the ulna, so as to produce a hinge-like arrangement, and the upper end of the radius forms also a small part of the joint. The surface of the humerus in contact with the ulna is limited, internally and externally, by a prominent ridge, and is hollowed out in the centre; that in contact with the radius is a small rounded eminence which moves in the cavity of the latter. In front of the humerus, above the articular surface, are two depre ions that receive the coronoid proce and the head of the radius during flexure, and behind is a large fo a for the reception of the olecranon, or large proce of the ulna, in the extension of the forearm. Where the bones touch, their surfaces are covered with cartilage, and their articular ends are kept in place by a number of ligaments. ( Naut .) The angle in each of the two cables by which a ship is moored, made by the intertwisting of those cables consequent on the swinging of the ve el. To form on E. , one cable must cro the other cable, and then reach the ground on the same side as it leaves the ship's bow. El'bow, v. a. To push with the elbow; to push or drive to a distance; to encroach on. -v. n. To put into an angle; to project; to bend. El bow-chair, n. A chair with arms to support the elbows.