I/O 



A MANUAL OF ANATOMY 



lingual, the second upper and first lower molars have each four, 

 and the second lower molar has five. 



Eruption of the Teeth. — ^The eruption of particular teeth of the 

 lower jaw precedes that of the corresponding teeth of the upper 

 jaw, and the periods are as follows: 



Temporary Teeth. 



Incisors 

 First molars 

 Canines 

 Second molars 



6th to 1 2th month, 

 rath to 14th ,, 

 14th to 2oth „ 

 20th to 24th „ 



Dentine ., 

 Pulp Cavity . 



Prolongation of Pulp Cavity 

 into Fangs 



y Enamel on Crown 

 — Dentine 

 -Neck 



..Pulp Cavity 



-" Dentine 



Crusta Petrosa 



Fig. 



Opening on Apex of Fang 



94. — Sections of Teeth. 



A, Lower Molar; B, Lower Incisor. 



Permanent Teeth. 



First molars 

 Central incisors. . 

 Lateral incisors . . 

 First bicuspids . . 

 Second bicuspids 

 Canines . . 

 Second molars . . 

 Third molars 



Gth year. 



7th 



8th 



gth 

 loth 

 nth 

 1 2th „ 

 1 7th to 25th year. 



About the sixth year is the period at which most teeth are present 

 in the jaws, there being the twenty temporary teeth, and all the 

 permanent, except the four wisdom teeth, (namely, twenty-eight), 

 making in all forty-eight. 



