Station 3 Flashcards
What are the 2 layers of the pleura? What is the membrane?
Pleura = a continuous serosal membrane - simple squamous epithelium with underlying connective tissue
Visceral adheres to the lung
Parietal adheres to the thoracic wall, diaphragm and mediastinum
Where are the visceral and parietal pleura continuous?
Hilum
What is the pleural cavity? What does it normally contain>
A potential space between the visceral and parietal pleura. Normally contains a thin layer of serous fluid that creates surface tension which keeps the visceral and parietal layers together
What is inflammation of the two pleural layers called?
Pleurisy
What are the 2 lines of pleural reflection?
Costodiaphragmatic
Costomediastinal
What is the surface anatomy of the costomediastinal pleural reflection?
R lung: descends along the midline, posterior to the sternum, to the xiphoid process.
L lung: descends along the midline, posteriorly to the sternum, till costal cartilage 4, at which point it deviates laterally to the edge of the sternum at the 6th costal cartilage. It then deviates further laterally to the 8th rib in the mid-claviular line.
What is the sirface anatomy of the Costodiaphragmatic pleural reflection?
For both lungs:
Anteriorly, the 8th rib, the 10th rib in mid-axillar line, then T12 posteriorly
How do the lines of pleural reflection compare to the location of the inferior border of the lungs during normal quiet respiration?
They tend to sit 2 ribs lower than the inferior margin of the lungs
What is the costomediastinal recess?
Where the costal pleura meets the mediastinal pleura
What is the costodiaphragmatic recess?
Where the costal pleura meets the diaphragmatic pleura
What are the pleural surfaces?
Cervical (superiorly)
Mediastinal (midline)
Diaphragmatic (inferiorly)
Costal (around/laterally/posteriorly)
