DISSECTION OF THE THORAX 



427 



its subdivisions, also the branches of the pulmonary artery and 

 pulmonary veins in each lung. Compare the intrapulmonary 

 bronchi of the two lungs. Dissect out the wall of a larger bron- 

 chus; examine its muscular coat (tunica muscularis), the sub- 

 mucous layer (tela submucosa), and the mucous coat (tunica 

 mucosa) ; in the latter note the bronchial glands (Gl. bron- 

 chiales) and the bronchial lymph-nodules (noduli lymphatici 

 broncMales). How far down in a bronchus does the cartilage 

 extend ? 



Study a corrosion-preparation of the bronchi and their sub- 

 divisions. With the help of atlases, sections, and the model (Fig. 

 218) by W. S. Miller, of the University of Wisconsin, study the 

 size, shape, and relations of the following : 



3 sacculi alveolares 



FlG. 218. 

 Atrium with 3 sacculi alveolares 



Sacculus alveolaris 



Atrium with the surfaces 

 of attachment of 3 sacculi alveolares 



Atrium (sacculi 



alveolares cut away) 



Venula pulmonalis 



Arteriolae pulmonales 



Alveoli pulmonis 



Venula 

 pulmonalis 



Atrium (with 

 J s-icculi, 

 1 cut away) ' 

 Atrium (sacculi 

 cut away 1 ) 

 Venula pulmomilis 



Diu-tulu.s alveolaris 



Bronchiolus respiratorius 



Alveolar duct, with branches and blood-vessels, from the dog. (After Spalteholz, Hand Atlas 

 of Human Anatomy, Leipzig, 1903, vol. iii. p. 567, Fig. 624.) 



(a) Bronchioles (bronchioli). 



(b) Respiratory bronchioles (bronchioli respirator ii). 



(c) Terminal bronchi, or alveolar ductules (ductuli alveolares). 



These open through the vestibules (iv*/ //><///) into the 



(d) Atria. 



The latter communicate through the air-sac passages with 



(e) Air-sacs (sacculi alveolares) (0. T. infundibula), which are studded 



with many 



(f) Air-cells or pulmonary alveoli (air col i pulmonis}. 



