respiratory tube trachea http://upload.wikimedia.org/wikipedia/commons/9/9f/Illu_conducting_passages.svg http://upload.wikimedia.org/wikipedia/commons/c/c3/Illu_conducting_passages.jpg UBERON:0003126 OpenCyc:Mx4rvViOX5wpEbGdrcN5Y29ycA in mouse 15-18 C-rings, 15-20 in human. FMA:7394 EHDAA2:0002066 EFO:0000935 XAO:0000118 EHDAA:3078 The trachea is the portion of the airway that attaches to the bronchi as it branches [GO:dph]. vertebrate trachea MA:0000441 tracheal tubule UMLS:C0040578 cartilaginous trachea EV:0100040 The respiratory tube between the larynx and the bronchi. [Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Glossary_G-29, Grande_L, Liem_KF, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF][VHOG] EMAPA:16853 AAO:0010140 In primitive fishes and most tetrapods, the lungs of adults are usually paired. They lie ventral to the digestive tract and are connected to the outside environment through the trachea.[well established][VHOG] tracheal MIAA:0000137 BTO:0001388 MESH:D014132 An elongated tube which carries air to and from the lungs.[AAO] VHOG:0000371 GAID:361 MAT:0000137 CALOHA:TS-1060 In birds, the trachea runs from the pharynx to the syrinx, from which the primary bronchi diverge. Swans have an unusually elongated trachea, part of which is coiled beneath the sternum; this may act as a resonator to amplify sound. In some birds, the cartilagenous rings are complete, and may even be ossified. In amphibians, the trachea is normally extremely short, and leads directly into the lungs, without clear primary bronchi. A longer trachea is, however found in some long-necked salamanders, and in caecilians. While there are irregular cartilagenous nodules on the amphibian trachea, these do not form the rings found in amniotes. The only vertebrate to have lungs, but no trachea, is Polypterus, in which the lungs arise directly from the pharynx. NCIT:C12428 windpipe uberon