THE TEETH 



221 



incisors are affected in this way that a positive diagnosis of 

 congenital syphilitic affection of the teeth may be made. 



Additional incisors and rudimentary fourth molars are 

 occasionally met with, but they are of special interest only 

 to the comparative anatomist. 



FIG. 84. Radiogram of Anterior Portion of Head, showing non-eruption 

 of the third upper molar tooth of the right side. The outline of the 

 tooth can be seen embedded in the maxilla. (From a Radiograph 

 by CHAS. A. CLARK, Esq., L.D.S.Eng.) 



The nerve-supply of the teeth is derived from the trigeminal 

 nerve. The maxillary nerve supplies the teeth of the maxilla 

 and the mandibular nerve those of the mandible. 



The lymph vessels of the maxillary teeth terminate in the 

 submaxillary lymph glands, which are closely related to the 

 submaxillary salivary gland; those from the molar teeth are 



