title: The lung air sac system of birds. A contribution to the functional anatomy of the respiratory apparatus.
mesh_terms: D000009:Abdominal Muscles / Q000033:anatomy & histology; D000400:Air Sacs / Q000033:anatomy & histology*; D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D001980:Bronchi / Q000033:anatomy & histology; D002645:Chickens / Q000033:anatomy & histology; D010856:Columbidae / Q000033:anatomy & histology; D004372:Ducks / Q000033:anatomy & histology; D005777:Geese / Q000033:anatomy & histology; D010529:Peritoneal Cavity / Q000033:anatomy & histology; D011563:Psittaciformes / Q000033:anatomy & histology; D013909:Thorax / Q000033:anatomy & histology