. Chordate anatomy. Chordata; Anatomy, Comparative. THE RESPIRATORY SYSTEM 261 their walls, they function only slightly in gaseous exchange. They serve as a reservoir of non-vitiated air which is used when the vitiated air is forced. Fig. 242.—Air sacs and canals of pigeon, c'-c^, intertransverse canals; da^-da"^, axillary sac and its ventral diverticulum; dc, canal for ribs; dot, infraclavicular canal; ds, subscapular sac; dst, sternal canal; pc, preacetabular canal; sad, sas, right and left abdominal sacs; sc, cervical sac; sia, sip, anterior and posterior intermediate sacs. (From Kings
. Chordate anatomy. Chordata; Anatomy, Comparative. THE RESPIRATORY SYSTEM 261 their walls, they function only slightly in gaseous exchange. They serve as a reservoir of non-vitiated air which is used when the vitiated air is forced. Fig. 242.—Air sacs and canals of pigeon, c'-c^, intertransverse canals; da^-da"^, axillary sac and its ventral diverticulum; dc, canal for ribs; dot, infraclavicular canal; ds, subscapular sac; dst, sternal canal; pc, preacetabular canal; sad, sas, right and left abdominal sacs; sc, cervical sac; sia, sip, anterior and posterior intermediate sacs. (From Kingsley's "Comparative Anatomy of Vertebrates," after Bruno Miiller.) from the lungs. Thus there is a double tide of fresh air through the lungs. Wetmore suggests that they assist in the regulation of body tem- perature, which is higher in birds than in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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