SALIVARY GLANDS OF LOWER PRIMATES 



79 



lower mammalian orders. In describing tliis portion of the primate 

 oral cavity the topographical relation of the Ungual nerve to the lateral 

 alveolingual gland field is not used in the sense in which Ranvier, and 

 later Zumstein, employed it in defining a so-called "retrolingual" gland 

 (cf. Schulte, Part VIII). 



The close apposition of the primate lingual nerve (j8) to the oral 

 mucosa, and its consequent relation to the lateral gland field, appears to 

 depend upon the high vertical index of the primate mandibular ramus. 



Fig. B. 



This forces the proximal portion of the lingual nerve into a parallel verti- 

 cal position and brings the terminal segment, in approaching the tongue, 

 into close contact with lateral oral mucosa. The difference in the 

 topograpliical relations of the lingual nerve and of the glands of the 

 alveolingual area may be indicated in the following schema, Fig. 

 A representing the primate condition. Fig. B that obtaining in a 

 generalized mammal of the lower orders. 



The above is a provisional and tentative terminology, adopted merely 

 for sake of consistency in the description of the adult morphological 

 and topographical conditions encountered in the primate series in- 

 vestigated. A discussion of its bearing on the human sub- and inter- 

 mandibular complex, and its relation to the genetic problems of the 

 salivary complex of this region, is reserved for a summary based on the 

 individual findings here recorded and on Schulte's ontogenetic analysis 

 of the human, ungulate, and carnivore salivary apparatus. 



