Thorax 2 Flashcards
label the 5 divisions of the mediastinum
Where does the trachea bifurcate?
At the level of the sternal angle into the bronchi - carina t4/5
what are the 5 lobes and fissures of the lungs?
which lung does not have a middle lobe and why?
left
apex of heart (ventricle) projects to the left
what is lung cardiac notch and lingula?
a concave impression molded to accommodate the shape of the heart
The lingula is not technically a lobe, but is the left lung equivalent of the right lung’s middle lobe.
How and why are the costal surfaces separated from the ribs?
Serous lining
Prevent damage during respiration
What is a bronchopulmonary segment?
What is the clinical significance of a bronchopulmonary segment?
How many bronchopulmonary segments do we have?
label them
An area of lung supplied by a segmental (tertiary) bronchus and accompanying pulmonary artery branch + pulmonary vein
Smallest, functionally independent unit of a lung and smallest area that can be isolated and removed without affecting adjacent regions
10 in each lung (8-10 in left) as some of them fuse in the left lung
Give the 3 sites of potential fusion in the left lung
-Fusion between apical and posterior segments of the superior lobe
-Fusion between superior and inferior lingular segments
-Fusion between medial and anterior basal; collectively termed as the anteromedial basal
label what u can
what does parietal and visceral pleura line?
what is the pleural cavity?
whats in it?
parietal - thoracic cavity
visceral - organs/ lungs
The pleural cavity is a potential space between the parietal and visceral layers.
pleural fluid
Where do the bronchial arteries originate from?
right bronchial artery x1 = from the posterior 3rd intercostal artery
left bronchial artery x2 = from aorta (descending throacic)
Where do the pulmonary arteries originate from?
Compare the pressure between the bronchial and pulmonary arteries
How do the bronchial and pulmonary arteries join together?
From the heart itself
Much higher pressure in bronchial
-Connection between the two at the capillary bed level, allows for nourishment of pulmonary as bronchial is highly oxygenated
Identify impressions on the lung made by adjacent structures
Right lung: Superior vena cava; arch of azygos vein
o Left lung: Arch of the aorta, left common carotid and subclavian arteries
what is in the hilum? (lung root) and how do they differ in each lung?
Bronchus at the BACK
Artery ABOVE the vein
label the divisions of the parietal pleura
1 - cervical
2 - costal
3 - diaphragmatic
4 - mediastinal
5 - pulmonary ligament
what does the pulmonary ligament do?
- Allows increased
mobility during
respiration
what are the recesses of the pleural cavity? what is occupied during respiration?
Costodiaphragmatic recess:
* Between costal and diaphragmatic parietal pleura
* Occupied by lungs during inspiration
- Costomediastinal recess:
- Between costal and mediastinal parietal pleura
- Occupied by anterior border of lungs during inspiration
Where do important nerves pass in relation to the lung root?
Vagus nerve passes immediately posterior to root
Phrenic nerve immediately anterior
Locate the pulmonary arteries, veins and bronchi in the hilum of the lungs
Explain the difference in bronchus branching between the 2 lungs
Right: the lobar bronchus to the superior lobe branches from the main bronchus in the root
Left: branches within the lung itself
Give the 4 layers of the trachea
MSCA
*Mucosa - goblet cells (mucin)
*Submucosa
*Fibrocartilage
*Adventitia - binds trachea to adjacent structures in the neck and mediastinum
What is the function of mucous and serous glands in the trachea?
Secretions of mucous and serous glands moisten the air, which protects the alveoli from desiccation
How is the trachea kept patent (open and unobstructed) ?
U-shaped rings of hyaline cartilage
What is the importance of the trachealis muscle?
Oesophagus expansion during swallowing