A depression or a groove found on the surface of an organ or tissue, as on the surface of the brain separating adjacent convolutions. Large sulci that divide the brain into lobes as well as the two hemispheres are more often called fissures. Plural: sulci. See fissure. calcarine sulcus See calcarine fissure.
Definition of SYNERGIST. : something (as a chemical or a muscle) that enhances the effectiveness of an active agent; broadly: either member of a synergistic pair.ADVERTISEMENT.noun synÂ·erÂ·gist \-jÉst\. something (as a chemical or a muscle) that enhances the effectiveness of an active agent; broadly: either member of a synergistic pair. ADVERTISEMENT.
They are synergistic because they both do flexion and right lateral flexion of the trunk at the spinal joints; they are antagonistic because the right external abdominal oblique does left rotation and the right internal abdominal oblique does right rotation of the trunk.hey are synergistic because they both do flexion and right lateral flexion of the trunk at the spinal joints; they are antagonistic because the right external abdominal oblique does left rotation and the right internal abdominal oblique does right rotation of the trunk.