Muscle Anantomy 101

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Muscle Anantomy 101

  1. 1. Muscle Anatomy 101
  2. 2. Three Types of Connective Tissue: Epimysium, Perimysium, and Endomysium
  3. 3. Sectional View of a Muscle Fiber
  4. 4. Sarcomere <ul><li>Smallest contractile unit </li></ul><ul><li>Composed of 2 proteins </li></ul><ul><li>Myosin </li></ul><ul><li>Actin </li></ul><ul><li>Run from Z-line to Z-line </li></ul>
  5. 5. Interaction Between Actin and Myosin Filaments
  6. 6. Muscle Fibers <ul><li>Vary in length </li></ul><ul><li>Held together by connective tissue </li></ul><ul><li>Multi-nucleated </li></ul><ul><li>Two types </li></ul><ul><li>Type I – high oxidative (slow twitch) </li></ul><ul><li>Type II – IIa = oxidative-glycolytic (fast twitch) </li></ul><ul><li>IIx = high glycolytic (fast twitch) </li></ul>
  7. 7. Muscle Fibers <ul><li>Hereditary factors vary ratio amongst people </li></ul><ul><li>Fiber type cannot be changed </li></ul><ul><li>Exception IIa IIx </li></ul><ul><li>*not 100% positive </li></ul>
  8. 8. Relative Involvement of Muscle Fiber Types in Sport Events Event Type I Type II 100-m sprint Low High 800-m run High High Marathon High Low Olympic weightlifting Low High Barbell squat High High Soccer High High Field hockey High High Football wide receiver Low High Football lineman High High Basketball Low High Distance cycling High Low
  9. 9. Motor Units <ul><li>Motor Neuron + Muscle Fibers </li></ul><ul><li>Type I or Type II </li></ul><ul><li>Not located adjacent to each other </li></ul><ul><li>Sizes vary </li></ul><ul><li>Smaller unit = fewer fibers = more precision </li></ul><ul><li>Larger unit = more fibers = gross movement </li></ul>
  10. 10. A Motor Unit
  11. 12. Muscles of the Body <ul><li>Primary movers = agonist </li></ul><ul><li>Assistant movers = synergists </li></ul><ul><li>Opposing muscles = antagonists </li></ul>
  12. 13. Muscles of the Body <ul><li>Origin = closest to core of body </li></ul><ul><li>Insertion = furthest from core of body </li></ul><ul><li>Multiple heads provide fine tune function </li></ul><ul><li>Spanning over more than one joint allows muscle to serve more than one function </li></ul>

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