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.
MUSCLE WORKING IN PAIRS. Muscles usually work in pairs or groups, e.g. the biceps flexes the elbow and the triceps extends it. This is called antagonistic muscle action. The working muscle is called the prime mover or agonist. (it s in agony!) The relaxing muscle is the antagonist.The other main pair of muscle that work together are the quadriceps and hamstrings.The prime mover is helped by other muscles called synergists.USCLE WORKING IN PAIRS. Muscles usually work in pairs or groups, e.g. the biceps flexes the elbow and the triceps extends it. This is called antagonistic muscle action. The working muscle is called the prime mover or agonist. (it s in agony!) The relaxing muscle is the antagonist.