A STUDY OF BLOOD MANUFACTURE 



81 



and of hard intercellular substance. In the central part of 

 the tooth is the pulp cavity. This region is well supplied 

 with nerves and blood vessels,which enter through a small 



Cement or crusta petrosa 

 Alveolar periosteum or root-membrane 



FIG. 26. Longitudinal Section FIG. 27. The Mouth widely opened, 

 of a Canine Tooth. 



C.p. = circumvallate papillae of tongue. 



F.p. = fungiform papillae of tongue. 



Tn = tonsil. 



Uv = uvula (a projection of the soft 



palate). 



V= branches to palate of fifth nerve. 

 VIII = branches to tongue of ninth nerve. 



aperture at the end of the fang. The blood furnishes the 

 teeth with new building material, and it is probable that the 

 nerves in some way direct the processes of nutrition. 



3. THE TONGUE 



Structure of the Tongue. The tongue is an elongated mass 

 of muscular tissue., attached behind to the floor of the mouth. 



