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Chapter 6 The Muscular System PowerPoint PPT Presentation


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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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Chapter 6The 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

  • 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


Naming of Skeletal Muscles

  • Direction of muscle fibers

    • Example: rectus (straight)

  • Relative size of the muscle

    • Example: maximus (largest)


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)


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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