. The chordates. Chordata. Sauropsida: Class Aves 521. Fig. 409. Air-sacs and canals of pigeon, (cl, c3) Intertransverse canals; (da1—da2) axillary sac and its ventral diverticulum; (dc) canal for ribs; (dfa, dfp) anterior and posterior femoral ducts; (dot) infraclavicular canal; (ds) subscapular sac; (dst) sternal canal; (pc) preacetabular canal; (sac?, sas) right and left abdominal sacs; (sc) cervical sac; {sia, sip) anterior and posterior intermediate sacs. (After Miiller. Courtesy, Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.) 410): cervica
. The chordates. Chordata. Sauropsida: Class Aves 521. Fig. 409. Air-sacs and canals of pigeon, (cl, c3) Intertransverse canals; (da1—da2) axillary sac and its ventral diverticulum; (dc) canal for ribs; (dfa, dfp) anterior and posterior femoral ducts; (dot) infraclavicular canal; (ds) subscapular sac; (dst) sternal canal; (pc) preacetabular canal; (sac?, sas) right and left abdominal sacs; (sc) cervical sac; {sia, sip) anterior and posterior intermediate sacs. (After Miiller. Courtesy, Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.) 410): cervical, lying on either side of the base of the neck (but single and median in the common chicken); interclavicular, commonly fused into a single median sac, in front of the sternum and between the two prongs (clavicles) of the furcula; anterior thoracic and posterior thoracic, situated as the names indicate, and ventral to the lungs; abdominal, the largest of all, lying dorsally in the abdominal cavity. Each cervical sac usually connects with a smaller axillary sac lying just beneath the skin under the base of the wing. All of the sacs are. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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