Muscular System

Front

Skeletal

Back

Striated and voluntary

Front

Cardiac

Back

• Branched, Striated and Involuntary

Front

Smooth

Back

• Visceral, Non-striated and involuntary

Front

1. Prime movers (agonists)

Back

• Provide the major force for producing a specific movement

  • Ex: Biceps brachii to flex forearm

Front

Antagonists

Back

• Oppose or reverse a particular movement

  • Ex: Triceps brachii during elbow flexion

Front

1. Synergists

Back

• Add force to a movement

• Reduce undesirable or unnecessary movement

  • Ex: relationship of brachialis to biceps brachii during elbow flexion

Front

1. Fixators

Back

• Synergists that immobilize a bone or muscle’s origin

  • Ex: Rotator cuff muscles and deltoid when the elbow is flexed and the hand grabs tabletop to lift the table.