Dr. Jackson is a life long resident of McNairy County. A graduate of McNairy Central High School, Dr. Jackson taught at Adamsville High School before he was named Principal in 1999. Dr. Jackson leads our schools as the Supervisor of Instruction.
antagonistic muscle - (physiology) a muscle that opposes the action of another; the biceps and triceps are antagonistic muscles. muscle, musculus-one of the contractile organs of the body. agonist-a muscle that contracts while another relaxes; when bending the elbow the biceps are the agonist.
(eks-ten'sÅr, -sÅr), [TA] 1  A muscle the contraction of which causes movement at a joint with the consequence that the limb or body assumes a more straight line, or so that the distance between the parts proximal and distal to the joint is increased or extended; the antagonist of a flexor. See: muscle.