. Outlines of zoology. e the modified blood passesby hepatic veins into the inferior vena cava.{b) The fat passes through the intestinal villi into the lymphaticvessels, which combine to form a thoracic duct, which runsforward and opens intp the left subclavian vein at its junctionwith the left external jugular. Here and there lie lymphaticglands. Bespiratory system.—The lungs are pink, spongy bodies,lying in the thorax,- connected with the exterior by thebronchial tubes and the trachea, and with the heart byblood vessels. The pleural membrane which invests thesurface of the lungs is reflected
. Outlines of zoology. e the modified blood passesby hepatic veins into the inferior vena cava.{b) The fat passes through the intestinal villi into the lymphaticvessels, which combine to form a thoracic duct, which runsforward and opens intp the left subclavian vein at its junctionwith the left external jugular. Here and there lie lymphaticglands. Bespiratory system.—The lungs are pink, spongy bodies,lying in the thorax,- connected with the exterior by thebronchial tubes and the trachea, and with the heart byblood vessels. The pleural membrane which invests thesurface of the lungs is reflected from the sides of thethoracic cavity. When the lungs expand, the pleuralcavity—between the two folds of pleural membrane—is 7i6 MAMMALIA. almost obliterated. The thoracic cavity is separated fromthe abdominal cavity by a partly muscular diaphragm,which is supplied by two phrenic nerves, arising from thefourth cervical spinal nerves. By its contraction thediaphragm alters the size of the thoracic cavity, and thus. Fig. 393. —Vertical section through rabbits head.—From a section,with help from Parkers Zooioiiiy and Krause. pmx., PremaxiUawith incisors ; , part ofmesethmoid partiiion ;tJ., maxillary turbinals; , ethmoidal tiirbinal ; ^ partof mesethmoid ; ol/.L, olfactoi-y lobe o^ cerebruni ;/.v., pre-spherioid; , position of corpus callosum ; Is., basisphenoidwith depression for pituitary body ; cl>., cerebellum ; , basi-occipital ; , spinal cord ; //.^., nasal passage ; ^i^-., gullet; ir.,trachea; v/>_^., epiglottis; siiij:,, submaxillary salivary gland;, sublingual sali\ary gland; T., tongue; //., transverseportion of palatine ; ;;/«., interior end of mandible. shares in the mechanism of respiration. At the top ofthe trachea lies the complex larynx, the seat of the voicein j\Tammals. Anteriorly the hirynx is supported on its sides and beneath by thethyroid cartilage ; behind this lies the ring-like cricoid ; dorsally to thecricoid a
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
