5g 



ANIMAL DENTISTRY. 



EVOLUTION OF THE PERMANENT TEETH. 



The clc\cl()i)Hient of the pennaiient teetli of animals be- 

 s^ins diirins;' the foetal life. Dnring- this period they are rep- 

 resented only 1)}' a stalk or neck extending- from the enamel 

 o-erm of their temporary analogues, located first on the side 



Fig. 41. 

 Mnhir Denture at Birth. 

 A. Infcri^■^ 4tli irolar. 

 P>. Superior 4th molar. 



and afterwards at the root. At the time of birth the germ of 

 the central incisors and the first, second and third molars 

 are alreadx- ])rominently formed at the root of the temporary 

 teeth, and the fourth molar — the hrst ]H'rn\'inent tootli to 

 develop — consists of a roimded hy];ertrophy of the common 

 enamel germ located just posterior to the third temporary 

 molar. (Fig". 41 A. B.) The temporary molars occupy the 



