158 ANATOMY AND PHYSIOLOGY FOR NURSES 



amount of saliva secreted in twenty-four hours has been 

 estimated at about 2\ pounds. The secretion of saliva is 



FlG. 76. Tooth: a, Enamel; b, dentin ; c, pulp-cavity; d, junction of 

 enamel and cementum ; e, cementum ; /, alveolar periosteum (Leroy). 



influenced through movements of mastication, by dry 

 substances, and by speaking; moreover, saliva is poured 





FlG. 77. Diagram showing the temporary teeth: a, Central incisors; 

 6, lateral incisors ; c t canines ; d, anterior molars ; e, posterior molars 

 (J. P. C. Griffith). 



out in great quantities through the influence of anything 

 which excites taste. 



