Keith, Sir Arthur


Keith,

Sir Arthur, Scottish anatomist, 1866-1955. Keith bundle - modified cardiac muscle fibers. Synonym(s): atrioventricular bundleKeith and Flack node - the mass of specialized cardiac muscle fibers that normally acts as the pacemaker of the cardiac conduction system. Synonym(s): Flack node; Keith node; sinuatrial nodeKeith node - Synonym(s): Keith and Flack node