Title: Gross scheme of a lung lobule and its vascularization
Scheme of branching of intrapulmonary bronchus, human. A small intrapulmonal bronchus with cartilage rings (1) divides into bronchioles (2), at (3) the terminal bronchioles that continues into respiratory bronchioles (4) followed by alveolar ducts (5) and at (6) the alveoli.
A respiratory bronchiole with alveolar ducts/ alveoli forms a small lobular unit,
the so-called lung acinus (4+5+6).
A lung lobule (lobulus) comprises of about 200-300 acini. The black pulmonary artery (7) branches into the capillary system of the alveoli.
The bronchial arterial system (9) is mainly restricted to the bronchial and bronchiolar branches. The solitary pulmonary veins (8) draining the capillary system of the alveoli are located within the intersegmental septa (10). At (11) superficial lymphatic plexus within the visceral pleura and (12) indicates the deep pulmonary lymphatic plexus.
Keywords/Mesh: respiratory tract, lung,
intrapulmonary bronchus, bronchiole,
respiratory bronchiole, alveolar duct, alveolus, capillary, pulmonary artery,
pulmonary vein, bronchial artery, lymphatic plexus, visceral pleura, histology, POJA collection
Title: Capillary system of lung alveoli (1)
Specimen injected with Indian-ink via the pulmonary system, cat. En face view of the alveolar wall: the black- and granular-stained capillary plexus is well shown. The larger vessels represent branches of the pulmonary arteriole.
Title: Capillary system of a lung alveolus (2)
Specimen injected with trypan blue in gelatin via the pulmonary system, cat. In a tangential view the blue-stained dense capillary plexus of one alveolus is well shown.