THE ANATOMY OF THE ADULT HUMAN SALIVARY GLANDS 21 



cleavage of the entire mass into several distinct districts. The 

 preparation also demonstrates well the topographical relations of the 

 lesser sublingual glands (j) to the submaxillary (/) and greater sub- 

 lingual glands (2) and to their ducts. 



In Fig. 9, the lesser sublingual glands (j) form a trapezoid mass 

 covering the lateral aspect of the submaxillary duct which receives a 

 short duct draining a ventral secondary submaxillary gland (/')• 

 Mesal to the submaxillary duct, between it and the lateral border of 

 the tongue, a small aggregation of glandular nodules (4) represents 

 "Weber's gland." A well-marked group of isthmian glands (j') 

 lie along the dorsal border of the lingual nerve, separated by a short 

 gland-free interval from the caudal prolongation of the lesser sub- 

 ungual gland proper. 



Comparison of Figs. 9 and 17 shows an interesting conformity to 

 the same type in the organization of the adult alveoUngual glandular 



field. 



Coincident with the development of an independent intermediate 

 or greater sublingual gland (2), and the unfolding of the submaxillary 

 line into four accessory submaxillary glands in the supramylohyoid 

 region, the individual shown in Fig. 1 5 exhibits a relative reduction of 

 the lesser sublingual group to a short and narrow band of individual 

 glands, deflected ventrolaterad in the figure, to expose the underlying 

 more medial structures. 



Finally Fig. 19 shows a preparation of the tongue and adjacent soft 

 parts removed after preUminary fixation through formaUn injection. 



This individual offers an unusual degree of development of the 

 lesser subUngual (j) and isthmian (j) glandular groups. The former, 

 ■ separated into two main divisions by a coronal cleavage line, extends 

 as a compact mass along the lateral border of the alveohngual field. 



The point of closest approximation of its caudal extremity to the 

 lingual nerve (j<S) is marked by the development of two small isolated 

 glandular collections beyond which the glandular line ascends along 

 the faucial pillar as an unusually well-developed series of closely 

 packed isthmian glands (j')- 



