EXCRETORY SYSTEM. 



6 75 



thus shares in the mechanism of respiration. At the top of 

 the trachea lies the complex larynx, the seat of the voice in 

 mammals. 



Anteriorly the larynx is supported on its sides and beneath by the 

 thyroid cartilage, behind this lies the ring-like cricoid, dorsally to the 

 cricoid are two small triangular arytenoids. 



Within the larynx there are stretched membranous bands the vocal 

 cords. Beside the larynx is the paired thyroid gland. 



cl 



e.t. 



b.o 



f.b. 



-tr 



T 



pi. 



\ 



\ smx 

 s.L 



epg 



FIG. 240. Vertical section through Rabbit's head. 

 (From a section, with help from PARKER'S Zootomy 

 and KRAUSE.) 



pinx., Premaxilla with incisors ; m.e., part of mesethmoid parti- 

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

 of mesethmoid ; olf.L, olfactory lobe of cerebrum ; ps., presphenoid ; 

 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.) sub-maxillary salivary gland ; s.L, sublingual salivary gland ; 

 T., tongue;^/., transverse portion of palatine; inn., anterior end 

 of mandible. 



Excretory System. 



The excretory system includes the blood filtering kidneys, 

 their ducts the ureters, and a reservoir or bladder, into 



