Ultrastructure of the lung alveoli as revealed by freeze-etching technique

The alveolar wall and the morphological equivalents of pulmonary surfactant have been studied by freeze-etching. Linear ridges on the fracture faces of the lamellae of lamellar bodies may represent early stages of transformation of lamellar bodies into tubular myelin. Parallel rows of particles on the fracture faces of tubular myelin are well documented, but the nature of these particles is not known.