bundle of his

from WordNet (r) 3.0 (2006)

bundle of His
    n 1: a bundle of modified heart muscle that transmits the
         cardiac impulse from the atrioventricular node to the
         ventricles causing them to contract [syn: {atrioventricular
         bundle}, {bundle of His}, {atrioventricular trunk},
         {truncus atrioventricularis}]