The pulmonary pleurae are the two flattened sacs ensheathing each lung, locally appearing as two opposing layers of serous membrane separating the lungs from the mediastinum and the inside surfaces of the surrounding chest walls.
Lung detail showing the pleurae. The pleural cavity is exaggerated since normally there is no space between the pulmonary pleurae.
Cytology of the normal mesothelial cells that line the pleurae, with typical features. Wright's stain.
The respiratory tract is the subdivision of the respiratory system involved with the process of conducting air to the alveoli for the purposes of gas exchange in mammals. The respiratory tract is lined with respiratory epithelium as respiratory mucosa.
Trachea Mainstem bronchus Lobar bronchus Segmental bronchus Bronchiole Alveolar duct Alveolus
3D still showing increased mucus.
3D still showing constricted airways.