Chapter 18: The musculoskeletal system

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Chapter 18: The musculoskeletal system
2011-08-31 22:52:33

ch. 18
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  1. orbicularis oculi
    around the eye
  2. orbicularis oris
    around the mouth
  3. masseter
    angle of the jaw (helps with chewing)
  4. bussenator
    cheek musclen (helps w whistling)
  5. deltoids
    above biceps (shoulder muscle)
  6. vastus lateralus
    to the side of the leg (where the nurse gives the children their shots).
  7. ribs
    • Cervical (first 7: 1st is axis 2nd is atlas)
    • Thoracic (12)
    • lumbar (5)
  8. First 7 pair of ribs:
    true ribs
  9. Last 5 pair of ribs:
    False ribs (bc they don't connect directly to sternum)
  10. Last 2 pair of ribs :
    floating ribs
  11. functions of the skeleton include:
    giving shape to the body and providing mobility.
  12. functions of muscles:
    • body movement
    • body circulation
    • heat production
  13. cardiac muscles
    • the middle layer of the heart (myocardium)
    • lightly striated
  14. Striated muscles:
    skeletal (voluntary) and cardiac muscles (involuntary)
  15. nonstriated muscles:
    smooth muscles (involuntary)
  16. voluntary movement:
    • enable walking
    • standing
    • sitting
    • and other movements
    • maintain body in upright position
    • participate in body balance
  17. Involuntary muscle action:
    • maintain heartbeat to pump blood
    • participate in reflexes
  18. Smooth muscles:
    • responsible for propelling through the urinary tract
    • moving food along the digestive tract
    • dilating the pupils of the eyes
  19. fascia
    covers each muscle.
  20. insertion
    part of the muscles that attaches to the bone that undergoes the greatest movement.
  21. belly
    main part of the muscle
  22. periosteum
    fibrous muscle tissue that covers the bone
  23. tendons
    attach muscle to bone
  24. intercostal muscles
    located between the ribs ( when they contract the thoracic cavity enlarges)
  25. Isometric contractions
    do not increase the length of a muscle but do increasse muscle tension
  26. Isotonic contractions
    shorten and thicken the muscle causing movement.
  27. Range of motion
    the total amount of motion that a joint is capable of.