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Chapter 6 The Muscular System

Chapter 6 The Muscular System. Types of Ordinary Body Movements. Flexion Extension Rotation Abduction Circumduction. Body Movements. Figure 6.13. Special Movements. Dorsifelxion Plantar flexion Inversion Eversion Supination Pronation Opposition. Types of Muscles.

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Chapter 6 The Muscular System

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  1. Chapter 6The Muscular System

  2. Types of Ordinary Body Movements • Flexion • Extension • Rotation • Abduction • Circumduction

  3. Body Movements Figure 6.13

  4. Special Movements • Dorsifelxion • Plantar flexion • Inversion • Eversion • Supination • Pronation • Opposition

  5. Types of Muscles • Prime mover – muscle with the major responsibility for a certain movement • Antagonist – muscle that opposes or reverses a prime mover • Synergist – muscle that aids a prime mover in a movement and helps prevent rotation • Fixator – stabilizes the origin of a prime mover

  6. Naming of Skeletal Muscles • Direction of muscle fibers • Example: rectus (straight) • Relative size of the muscle • Example: maximus (largest)

  7. Naming of Skeletal Muscles • Location of the muscle • Example: many muscles are named for bones (e.g., temporalis) • Number of origins • Example: triceps (three heads)

  8. Naming of Skeletal Muscles • Location of the muscles origin and insertion • Example: sterno (on the sternum) • Shape of the muscle • Example: deltoid (triangular) • Action of the muscle • Example: flexor and extensor (flexes or extends a bone)

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