20 THE ANATOMY OF THE ADULT HUMAN SALIVARY GLANDS 



duct, when present). The caudal pointed end ascends for a short 

 distance along the lingual nerve on the lateral aspect of the stylo- 

 glossus muscle. It does not, in this individual, extend dorsomesad 

 of the nerve into the palatine arch. 



This is the simplest type encountered in the adult human subject 

 in which the development of the lateral separate alveolingual gland 

 field is confined to the production of a circumscribed group of lesser 

 sublingual glands proper, cephalad of the lingual nerve line. In gen- 

 eral extent and relations tliis human t^pe closely conforms to the condi- 

 tions commonly encountered in the lower Old World primates, notably 

 the Macaques and Baboons (cf. Part III, page 83, Figs. 3 to 7 incL). 



Figure 17 shows another example of this tj^ae on the right side of 

 an adult human subject, in which the caudal prolongation of the lesser 

 sublingual mass is in contact, at the lingual nerve intersection, with a 

 large dorsal accessory subma.xillary gland (/"), but does not extend 

 beyond this point into the palatine arch. 



In contrast with the preceding preparation, the individual shown 

 in Fig. 7, in a similar exposure from the right side, illustrates a much 

 greater degree of development in the field of the separate lateral 

 alveolingual elements. The lesser sublingual group proper (j) main- 

 tains the typical triangular form. The caudal angle is, however, 

 prolonged along the lingual nerve dorsomesad into a distinct isthmian 

 group of glands (j') occupying the anterior faucial pillar and disappear- 

 ing under the cut edge of ramus and internal pterygoid muscle on its 

 way toward the palate. 



In addition a distinct group of four glandular lobules (4) rest on 

 the lateral surface of the tongue, mesad to the main submaxillary duct. 

 These are the medial lesser sublingual detached elements which form 

 the so-called " Gland of Weber." 



Figure 16 exhibits one of the frecjuently encountered types in which 

 the lesser sublingual mass (j) is divided by a sagittal cleft into two 

 distinct segments (j'' and j^). (Cf, supra, page 18.) The caudal 

 extremity of the gland, prolonged along the dorsal border of the lingual 

 nerve, is separated by a short gland-free interval from a detached 

 collection of isthmian glands (j')- 



Figure 10. showing the lesser sublingual group hardened in situ in 

 an exposure from the medial side, affords another example of the 



