Exam 3: Thoracic Wall and Pleural Cavities

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Exam 3: Thoracic Wall and Pleural Cavities
2012-07-09 13:30:15
anatomy thoracic wall pleural cavities

review of 7/9 lecture on thoracic wall and pleural cavities for exam 3
Show Answers:

  1. What is the thorax?
    the region between the neck and abdomen
  2. What are the contents ofthe thorax?
    • heart
    • lungs
    • structures passing between neck and abdomen 
  3. What is the shape of the thorax?
    truncated cone with an inlet (where the neck joints the thorax) and an outlet, which is closed off by repiratory diaphragm
  4. The bony thorax consists of which structures?
    • 12 thoracic vertebrae
    • 12 pairs of costae (ribs and costal cartilages)
    • sternum consiting of manubrium, body and xiphoid process  
  5. What are the thoracic apetures?
    • thoracic inlet
    • thoracic outlet
  6. What are some other names for the thoracic inlet?
    • superior thoracic aperture
    • thoracic outlet (to clinicians) 
  7. What is another name for the thoracic outlet?
    inferior thoracic aperture
  8. What is the costal margin?
    where costal cartilages of ribs 7-10 blend together
  9. What are the bony boundaries of the thoracic inlet?
    • body of 1st thoracic vertebra posteriorly
    • 1st pair of costae laterally
    • manubrium anteriorly
  10. What are the bony boundaries of the thoracic outlet?
    • body of 12th thoracic vertebra posteriorly
    • 11th and 12th costae laterally
    • Xiphoid process and costal cartilages 7-10 anteriorly  
  11. What does the respiratory diaphragm separate?
    thorax from abdomen
  12. What closes off the thoracic outlet?
    respiratory diaphragm
  13. How high does te dome of the diaphragm rise to provide protection to thoracic and some abdominal viscera?
    rises to level of 5th intercostal space on right side and 6th intercostal space on the left side
  14. What makes up the sternum?
    • manubrium
    • body
    • xiphoid process  
  15. What does the manubrium articulate with?
    • clavicles
    • 1st pair of ribs
    • 2nd pair of ribs
    • body of sternum 
  16. Where does the manubrium articulate with the clavicles?
    by way of sternoclavicular joints
  17. Where does the 2nd pair of ribs articulate with the manubrium?
    at sternal angle
  18. Where does the body of the sternum articulate with the manubrium?
    at sternal angle
  19. Is the sternal angle the same between men and women?
  20. Is the sternal angle more acute in women or men? Why?
    • more acute in women
    • men typically have larger thoracic cage and therefore have bigger heart and lungs
  21. What is the body of the sternum composed of?
    four fused stenebrae
  22. Are the four sternebrae making the body of the sternum ever not fused?
    yes, they are separate in infants
  23. What does the body of the sternum articulate with?
    • manubrium
    • costal cartilages 2-7
    • xiphoid process
  24. What does the manubriosternal joint allow?
    hinge-like movement of body both anteriorly and posteriorly
  25. The manubriosternal joint faciliates increased repiration by allowing what?
    expansion of thoracic cavity
  26. Where is the xiphisternal joint?
    at level of T8 vertebrae
  27. Is the xiphisternal joint easily palpated?
  28. When is the tip (inferior point) of the xiphoid process palpated?
    with discomfort
  29. How many points does the xiphoid process have?
    usually one but having two points (bifid) is common
  30. What is the shape of the xiphoid and how long is it?
    length and shape are highly variable from person to person
  31. How many types of ribs are there?
  32. What are the 3 types of ribs based on?
    their attachments to the sternum
  33. What are the 3 classifications of ribs?
    • true ribs
    • false ribs
    • floating ribs  
  34. Which ribs are true ribs?
  35. What makes ribs 1-7 true ribs?
    costal cartilages attached directly to sternum
  36. Which ribs are false ribs?
  37. What makes ribs 8-10 false ribs?
    have their costal cartilage attached indirectly to the sternum
  38. Which ribs are floating ribs?
  39. What makes ribs 11 and 12 floating ribs?
    do not have any attachment to sternum
  40. Muscle layers of the intercostal spaces consist of the following three itercostal muscles:
    • superficial: external intercostal
    • middle: internal intercostal
    • deepest: innermost intercostal  
  41. The most superficial layer of the intercostal spaces consists of which muscles?
    external intecstal
  42. Where do the external intercostals extend?
    from tubercles of ribs to junction of costal cartilages with bony ribs
  43. Where does the external intercostal membrane pass?
    from anterior margin of muscle to lateral borde of sternum
  44. What is the orientation of the fibers of the external intercostal muscles?
    inferomedial orientation
  45. What happens when external intercostals contract?
    ribs are elevated
  46. The middle layer of the intercostl spaces consists of which muscles?
    internal intercostals
  47. Where do internal intercostals extend?
    from sternum to mid-axillary line
  48. The internal intercostal membrane passes where?
    from lateral margin of this muscle to the region of the vertebral column to fuse with supeiror costotransverse ligaments
  49. What is the orientation of the fibers of the internal intercostal muscles?
  50. What is the action occurs upon contraction of the internal intercostals?
    ribs are depressed
  51. The deepest layer of the intercostal spaces consists of which muscles?
    innermost intercostals
  52. Where do the innermost intercostals extend?
    from angles of ribs to just anterior of the mid-axillary line
  53. The innermost intercostal membrane passes where?
    from anterior border of muscle to lateral border of transverus throacis muscle
  54. The fibers of the innermost intercostals have he same orientation and function as which muscle?
    internal intercostal
  55. Where does transverus thoracis muscle extend?
    from posterior surface of lower 2 of the body of the sternum and the xiphoid process to the costochondral junction of ribs 3-6
  56. How many transverus thoracis muscles are there?
    number varies from person to person
  57. What is the function of transverus thoracis muscle?
    depress ribs
  58. Where do intercostal nerves come from?
    ventral primary rami of T1-11
  59. The motor branches of the intercostal nerves innervate what?
    intercostal muscles
  60. The cutaneous branches of the intercostal nerves provide what?
    sensory innervation to the skin on the lateral and anterior surfaces of the thorax and abdomen
  61. How many pairs of posterior intercostal arteries are there?
    9 pairs
  62. The posterior intercostal arteries branch from what?
    descending aorta
  63. Where are the posterior intercostal arteries located?
    between two deepest layers of intercostal muscles in intercostal spaces 3-11
  64. The posterior intercostal arteries have muscular branches that supply what?
    intercostal, pectoral, and serratus anterior muscles
  65. In intercostal spaces 3-5 the lateral branches of the posterior intercostal arteries supply what in females?
  66. Supreme thoracic arteries are branches of what?
  67. What do supreme thoracic arteries supply?
    intercostal spaces 1-2
  68. Supreme intercostal arteries are branches of what?
    costocervical trunk
  69. What do the supreme intercostal arteries supply?
    intercostal spaces 1-2
  70. What are the branches of the internal thoracic artery?
    • anterior intercostal
    • superior epigastric
    • musculophrenic  
  71. Where does the superior epigastric artery go?
    rectus abdominus
  72. The anterior interostal arteries are branches of what?
    internal thoracic
  73. Where are the anterior intercostal arteries found?
    in intercostal spaces 1-6
  74. What do the anterior intercostal arteries supply?
    skin, intercostal muscles, breasts, and thymus gland (located in anterior mediastinum)
  75. The musculophrenic artery is a terminal branch of what?
    internal thoracic
  76. What does the musculophrenic artery provide?
    anterior intercostal arteries to intercostal spaces 7-9
  77. The musculophrenic artery has branches going where besides to intercostal spaces?
    respiratory diaphragm
  78. What separates right and left pleural cavities?
  79. What is the mediastinum?
    three dimensional space located between the pleural cavitis
  80. What does the parietal pleura line?
    pleural cavity
  81. The parietal pleura has several surfaces named for what?
     structures it contacts
  82. What is costal pleura attached to?
    ribs and intercostal space
  83. What is the mediastinal pleura adhered to?
  84. The diaphagmatic pleura adheres to what?
    superior surface of respiratory diaphragm
  85. The cervical pleura lines what?
    pleural cavity avove level of  1st ribs, in the root of the neck
  86. What does the visceral pleura cover?
    surfaces of the lungs
  87. The connecting layer of pleura surrounds what?
    the root of the lungs like a sleeve, covering structures passing into lungs
  88. Name the lines of reflection ofparietal pleura:
    • vertebrl reflection
    • sternal reflection
    • costal reflection  
  89. Where is the vrtebral reflection?
    where costal and mediastinal pleurae become continuous posteriorly
  90. Where is the sternal reflection?
    where costal and mediastinal pleurae become continuous anteriorly 
  91. Where is the costal reflection?
    where costal and diaphragmatic pleurae become continuous inferiorly
  92. Where do pleural recesses occur?
    where two layers of parietal pleura form an acute angle and are in direct contact with each other in the living person
  93. Do the lungs occupy the pleural recesses?
    normally they do not
  94. What may collect in these recesses?
    with certain respiratory infections various substances (such as pus, fluid, or dead cells)
  95. Where is the right costodiaphragmatic recess?
    laterally along costal reflection
  96. Where is the left costodiaphragmatic recess located?
    laterally along costal reflection
  97. Where is the left costomediastinal recess located?
    • anteriorly along sternal reflection
    • between upper lobe of left lung and the heart 
  98. The visceral pleura covering the lungs is normally in contact with what?
    parietal pleura a potential space is located between these pleural layers
  99. What do the pleural cavities contain?
    pleural fluid
  100. Where is pleural fluid produced?
    pleural membranes
  101. What does the pleural fluid do?
    lubricates surfaces of same membranes, preventing adhesions
  102. Where are the lungs found?
    in pleural sacs, not pleural cavities
  103. What are pleural sacs?
    spaces contained within the visceral pleurae
  104. What structures pass through the superior thoracic aperture?
    • cervical parietal pleura
    • ??
  105. Where are the intercostal vessels (nn/aa/vv)?
    running between innermost and internal intercostal mm
  106. What is the potential space between the visceral and parietal pleura?
    pleural cavity
  107. The visceral pleura is continuous with what?
    parietal pleura
  108. What are the pleural recesses?
    areas with no lung tissue
  109. What are places inside the pleural cavity where fluid might accumulate during infections?
    costodiaphragmatic recesses
  110. Where can you have a penetrating wound that enters the pleural cavity without going through intercostal spaces?
    • 1. above the first rib (pierces cervical pleura)
    • 2. costovertebral angle 
  111. What happens if the pleural cavity is punctured?
    collapsed lung
  112. Where are the costovertebral angles?
    between the lower border of the 12th rib and the diaphragmatic pleura (on top of diaphragm)
  113. If a needle goes into the costovertebral angle, it would puncture what and cause what?
    puncture parietal pleura and cause a collapsed lung