Upper level: s4  Structures of the cardiovascular, immunological and respiratory

s430  Structure of respiratory system

Lower livel:

• s4300  Trachea

• s4301  Lungs

• s4302  Thoracic cage

• s4303  Muscles of respiration

• s4308  Structure of respiratory system, other specified

• s4309  Structure of respiratory system, unspecified

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