335 13.2 Muscles of Respiration Part 1

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Author:
shanamd2011
ID:
148019
Filename:
335 13.2 Muscles of Respiration Part 1
Updated:
2012-04-16 21:06:48
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muscles respiration
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muscles of respiration
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  1. diaphragm characteristics
    • two domed muscle
    • divides thorax from abdomen
    • only muscles th inserts upon itself
  2. diaphragm
    changes during breathing
    • goes flat during inspiration
    • passively returns to dome-shape during
    • accounts for 60% of the work when breathing
    • especially in inhaling
  3. diahragm muscle
    • o - xiphoid process
    • c - superiorly and medially
    • ins - central tendon (aponeurosis) (upon itself)
    • inn - phrenic nerve from cervical plexus of spinal nerves (C3 C4 C5)
    • f - quiet inhalation
  4. diaphragm foramen 3
    • aortic hiatus (near spine) - descending abdominal aorta passes through here
    • vena cava / phrenic - deoxygenated blood from lower extremeties to heart
    • esophageal - esophagus passes here
  5. external intercostals
    • o - inferior surface of ribs 1-11
    • c - down and obliquely
    • ins - crest of the rib below
    • inn - intercostal nerves
    • f - raises ribs - quiet inhalation
  6. internal intercostals
    • o - inferior margin of ribs 1-11
    • c - down and lateral
    • ins - crest of the rib below
    • inn - intercostal nerves
    • f - raises ribs - quiet inhalation, lowers ribs - exhalation
  7. intercostals 3
    • fill the entire space between the ribs
    • contract vertically
    • maintain costal rigidity - give ribs support or strangth
  8. transverse thoracic (triangularis sterni)
    • o - posterior surface of sternum, xiphoid process, ____
    • ins - fans outward and upward, inferior edge of ribs 2-6
    • f - lowers ribs - exhalation
  9. levatores costarum
    (costal elevators)
    • o - transverse process of C7, T1 - T11
    • ins - outer surface of the next lower rib or two
    • f - raised ribs - forces inhalation
  10. serratus posterior superior
    • o - spinous process of C7 and T1 - T4
    • c - downward and outward
    • ins - near angus of ribs 2-6
    • f - raises ribs - forced inhalation (only when)
  11. serratus posterior inferior
    • o - spinous process of T11 - T12
    • c - upward and outward
    • ins - near angus of ribs 9-12
    • f - lowers ribs - exhalation

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