Histologic section of tracheal wall, mucosa at top, mucosal glands lying above the cartilage bar. Cross section GE larynx at level of cricoid, with continuous cartilaginous ring. Normal architecture of alveolar ducts and alveoli. Electron micrograph of alveolar type II cells.
Cytoplasm contains lamellar bodies of surfactant.
Cut surface of polyalveolar lobe, showing emphysema. Cut surface of resected cystic adenomatoid malformation. This bronchus is filled with inhaled amniotic squames and meconium granules. The infant had birth asphyxia. Hyaline membrane disease and congenital bronchopneumonia.