Updated: 12/15/2020

Lung Relationships

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Overview

Lungs

  • Extent of Lungs
    • apex is located above the clavicle 
    • base rests on the diaphragm
  • Right Lung
    • 3 lobes
      • upper (superior), middle, and lower (inferior) lobes
    • 2 fissures
      • oblique (major) fissure separates upper and lower lobes
      • horizontal (transverse) fissure separates upper and middle lobes
  • Left Lung
    • 2 lobes
      • upper (superior) and lower (inferior) lobes
    • 1 fissure
      • oblique fissure
    • cardiac notch
      • an indentation consequent to the deviation of apex of heart to left side
        • lingula is a flap of lung tissue of the left upper (superior) lobe that lies below cardiac notch
          • homolog of right middle lobe
        • the apex of the heart is covered anteriorly by the left lung
          • lies at the left fifth intercostal space at the midclavicular line
  • Hilum of Lung
    • a wedge-shaped area on mediastinal surface of each lung through which structures forming root of lung pass to enter or to exit lung
    • Relationship of pulmonary artery (PA) to bronchus ("RALS")
      • right lung: anterior to bronchus
      • left lung: superior to bronchus
  • Trachea
    • bifurcates into left and right (primary) main bronchi at level of sternal angle
      • right (primary) main bronchus is shorter, wider, and runs more vertically
        • foreign body is more likely to pass through right (primary) main bronchus and into right lung 
          • upright position
            • inferior (basal) portion of right lower (inferior) lobe
          • supine position
            • posterior portion of the right upper lobe
            • superior portion of right lower (inferior) lobe
 

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Questions (2)
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(M1.PL.13.26) A 27-year-old male is brought to the emergency room following a violent assault in which he was stabbed in the chest. The knife penetrated both the left lung and the left ventricle. Where did the knife most likely enter his chest? Tested Concept

QID: 100829
1

Left seventh intercostal space in the midaxillary line

0%

(0/62)

2

Left seventh intercostal space in the midclavicular line

5%

(3/62)

3

Left fifth intercostal space just lateral to the sternum

21%

(13/62)

4

Left fifth intercostal space in the midaxillary line

19%

(12/62)

5

Left fifth intercostal space in the midclavicular line

53%

(33/62)

M 2 E

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