Trachea, bronchi Flashcards
What is the trachea a continuation of?
The larynx
Where does the trachea arise?
C6
Lower border of cricoid cartilage
Where does the trachea travel?
Inferiorly into the superior mediastinum
anterior to the oesophagus
At what level does the trachea bifurcate?
Level of sternal angle
What does the trachea bifurcate into?
Primary bronchi, right and left
What is located at the bifurcation of the trachea into the right and left bronchi?
Carina
What is the carina?
Ridge of cartilage
What is the difference between the orientation of the primary right bronchus to the primary left bronchus?
Primary right bronchus is more vertical
What is the clinical signifiance of the primary right bronchus being more vertical than the primary left bronchus?
Aspirated foreign bodies are more likely to enter the primary right bronchus
Where do the primary bronchi branch up?
Within the lungs
What do the primary bronchi branch up into?
Secondary lobar bronchi
What do the secondary lobar bronchi supply?
Lobe of the lung
How many lobes does the right lung have?
Three
How many lobes does the left lung have?
Two
How many right secondary lobar bronchi are there?
Three
When does the secondary lobar bronchi for the superior lobe of the right lung arise?
Before the right primary bronchi enters the hilum of the lung
How many left secondary lobar bronchi are there?
Two
What do the secondary lobar brocnchi branch into?
Tertiary segmental bronchi
What do the tertiary segmental bronchi supply?
Bronchopulmonary segments
What is a bronchipulmonary segment?
Functional unit of lung
What is the supply and drainage of a bronchopulmonary segment?
Segmental bronchus supplies it with air
Segmental branch of pulmonary artery supplies it
Segmental branch of pulmonary vein drains it
What shape are bronchopulmonary segments?
Pyramid shaped
apex towards segmental bronchus
base towards surface of lung
What is the clinical significance of bronchopulmonary segments?
Important in lung surgery
can isolate bronchopulmonary segments with little leakage of air, bleeding
less interference in other bronchopulmonary segments
How many lobes did the left lung initially have?
Three
