I know that neutralizers may also be classified as stabilizers because it is their ability to keep joints balanced that holds motion along a specific path. A fixator muscle is a stabilizer that acts to eliminate the unnecessary movement of an agonist's, or prime mover's, origin. Whereas stabilizer muscles act to stabilize one joint so the desired movement can be performed in another joint. How do I classify the flexors carpi ulnaris, carpi radialis, digitorum superficialis, and the extensors radialis longus and brevis, carpi ulnaris, digitorum, and the flexors digitorum profundus, and digitorum superficialis into any one of the three main groups?

  • $\begingroup$ Many of these are easier to picture as prime movers or antagonists. See this for some basic ideas. More fundamentally, you need to define the roles of muscles for a particular motion. For example, students will often memorize that the flexor carpi ulnaris and extensor carpi ulnaris are "antagonists", but they need merely adduct their wrist (toward the little finger) to see this need not always be so. $\endgroup$ – Mike Serfas Dec 26 '20 at 15:54

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