THE DEVELOPMENT OF THE SALR'ARY GLANDS IN MAN 



63 



tirely disappeared. Vertically beneath it a similar element is attached 

 to the submaxillary duct, rather on its lateral aspect, as though the 

 duct had rotated slightly, and in the 22 millimeter embryo also this 

 element persists on one side. 



Fig. 26. Schema of anlages of submaxillary and greater sublingual glands 

 Stage of 20 millimeters. Embryo, No. 13. 



9. Submaxillary aniage. 12. Dorsal acces§ory*submaxillary. 



10. Greater sublingual aniage. 13. Postglandular flange. 



30. Lingual nerve. 



In the schema (Fig. 26) is shown the correspondence in position of 

 these elements (/2, ij) with the marginal zones of the earHer flange 

 (Fig. 25). With regard to the postglandular flange there is no evidence 

 as yet in the human embryo that it becomes the seat of proliferation 

 or sprouting. The element attached to the duct, however, in the 22 

 millimeter embryo, seems to be on the point of initiating this process. 

 In the subma.xillary complex of the lower primates both of the elements 

 are represented, the postglandular flange as the secondary submaxil- 



