8o8 



PHYLUM CHORDATA : CLASS MAMMALIA 



into branches in the hver, whence the modified blood passes 

 by hepatic veins into the inferior vena cava. 

 (b) The fat passes through the intestinal villi into the lymphatic 

 vessels, which combine to form a thoracic duct, which runs 

 forward and opens into the left subclavian vein at its junction 

 with the left external jugular. Here and there lie lymphatic 

 glands. 



Respiratory system. — The lungs are pink, spongy 



c.c. 



me 



smx 



Fig. 487. — Vertical section through rabbit's head. — From a section, 

 with help from Parker's Zootomy and Krause. 



pmx., Premaxilla with incisors ; m.e., part of mesethmoid partition ; 

 t.b., maxillary turbinals ; e.t., ethmoidal turbinal ; m.e., part 

 of mesethmoid ; olf.l., olfactory lobe of cerebrum ; ps., pre- 

 sphenoid ; c.c, position of corpus callosum ; bs., basisphenoid 

 with depression for pituitary body ; cb., cerebellum ; b.o., basi- 

 occipital ; s.c, spinal cord ; n.p., nasal passage ; g., gullet ; tr., 

 trachea ; epg., epiglottis ; smx., submaxillary salivary gland ; 

 S.I., sublingual salivary gland ; T., tongue ; pL, transverse 

 portion of palatine ; mn., anterior end of mandible. 



bodies, lying in the thorax, connected with the exterior by 

 the bronchial tubes and the trachea, and with the heart by 

 blood vessels. The pleural membrane which invests the 

 surface of the lungs is reflected from the sides of the 

 thoracic cavity. When the lungs expand, the pleural 

 cavity — between the two folds of pleural membrane — is 

 almost obliterated. The thoracic cavity is separated from 



