50 THE DEVELOPMENT OF THE SALIVARY GLANDS IN MAN 



with the inclined plugs of Chievitz and Sudler suggests that the 

 position of the plugs corresponds to the hypothenuse of the flange, 

 and that the plug acquires its freedom by a solution of continuity 

 in the primitive anlage. Sudler's reconstruction and statement show 

 no enlargement of the fundus, so that active proHferation on the part 

 of the free-growing duct cannot have been initiated in his embryo 

 at the time the separation took place, while in Hammar's and Paulet's 

 embryos, on the other hand, the anlage shows a distal enlargement 

 when it is still attached in its whole length. 



7- Sudler. Embryo XLIII, N.B. 14, V.B. 16. Probable age 6 

 weeks. The subma.xillary is "a straight cylindrical shaft with a 

 knob turned directly away from the middle hne. ... It is a 

 solid object throughout." 



8. His. Embryo Zw., 14.6 millimeters. In the illustration of this 

 embryo (Anat. mensch. Emb. Ill, Fig. 65) the submaxillary has a long 

 duct, which, after crossing the lingual nerve, is enlarged and studded 

 with numerous small knobs. No sublingualis major was present. It 

 is suggested that it may arise from the lateral sulcus near the alveolar 

 process, which is therefore termed sulcus sublingualis by His. 



9 and 10. Hammar. Embryos of 17 millimeters and 18.5 milli- 

 meters. The submaxillary duct is formed caudo-craniad by a con- 

 striction which frees the epithelial flange from the sulcus, while the 

 thickening of the earher stages, at the caudal end of the flange, en- 

 larges to form a retort-shaped gland body. 



11. Sudler. Embryo XXII, N.B. 18, V.B. 20. Probable age 7 

 weeks. The subma.xillary has grown into an "oval-shaped body 

 covered with rounded enlargements marking the future lobes of the 

 gland." Around it the connective tissue shows slight condensation. 

 No other salivary gland was observed in this embryo. 



12. Chie\'itz. Embryo of 8 weeks. After noting the presence of 

 an early condition of the plica fimbriata and subhngua, Chievitz de- 

 scribes the origin of the submaxillary from a median sulcus bordering 

 the tongue (sulcus lingualis). The point of attachment is 240 /^ caudal 

 to the plane of the angulus oris, and 40 fi nearer the frenulum than in 

 his embryo of 14 millimeters (6 weeks). The anlage is prolonged craniad 

 to the Hngual crossing by an epithelial keel or crest, such as appears in 

 the pig. This crest has a sagittal length of 200 m- A lumen is present 



