MOUTH. 



509 



surface. The papillae circumvallatae alone have a relation to 

 the sense of taste. The tongue is supported by the hyoid bone 

 and by a cartilaginous rod, which represents the os interglossum. 

 The anterior cornua of the hyoid are attached by ligament to 



FIG. 267. Entrance to the digestive apparatus and the respiratory organs of the cat (after 

 C. Heider). a head with exposed salivary glands. P parotid ; M sub-maxillary ; Su 

 sub-lingual. & Longitudinal section through the head and thorax ; the respiratory organs 

 are seen from the side, c Longitudinal section through the larynx ( L) and the first part 

 of the trachea (Tr.). B thymus ; C corpus callosum ; Cb cerebellum; Cg corpora quad- 

 rigemina ; D Diaphragm ; E epiglottis ; H cerebral hemispheres ; Hy hypophysis ; L 

 larynx ; M mouth ; a nasal aperture ; Nm turbinal bones ; Oe oesophagus ; P lung ; 

 Pa velum palati ; R spinal cord ; S vocal cord ; St sternum ; T thyroid ; Tr trachea : 

 Tu opening of eustachian tube into the pharynx ; W vertebral column ; Z tongue ; Zb 

 hyoid. 



the styloid processes of the temporal bone or its equivalent, the 

 posterior bear the larynx. Beneath the tongue there is some- 

 times (most developed in the Insectivora) a single or double 

 projection, which is termed the sublingua. The sides of the 

 buccal cavity are soft and fleshy, and are not unfrequently in 



