THE ANATOMY OF THE ADULT HUMAN SALIVARY GLANDS IS 



well as the direction and length of its duct, entitle it, I think, to recog- 

 nition when it appears in the human subject, and I have hence desig- 

 nated it under the term secondary submaxillary gland and duct. 

 Functionally it is, of course, the equivalent of the more commonly 

 encountered ventral accessory gland above described and illustrated, 

 and its elements are derived from the same portion of the common 

 primitive alveohngual glandular field which gives origin to the latter 

 structure. But its distinct adult morphological characters imply a 

 different genetic use of the available primitive glandular anlages to 

 produce the final result, and hence, at least tentatively, the suggested 

 differentiation of the two elements appears justified. 



In its simplest form the adult human secondary submaxillary gland 

 (i') is shown on the left side in Fig. 9. It forms a rounded body, 

 situated above the mylohyoid, in contact with the cephalic margin 

 . of the main submaxillary gland ( i) and partly covered by the latter's 

 mesal surface. The duct ascends, crossing the medial side of the 

 lingual nerve {38) and enters the ventral border of the main submaxil- 

 lary duct under cover of the caudal extremity of the lesser sublingual 

 mass. There are no accessory submaxillary glands in tliis individual. 

 A higher degree of independence is achieved on the right side of the 

 example shown in Fig. 7. Here the main inframylohyoid portion 

 of the submaxillary gland (/) is composed of two lobes, separated by 

 a vertical cleft. The dorsal pole of this mass is capped by an extensive 

 accessory submaxiUary gland (/") whose duct runs forwards, above 

 the mylohyoid, is joined by the duct of a similar smaller gland (/"), 

 and then empties almost immediately into the dorsal aspect of the 

 main submaxillary canal just caudal to the intersection of the same 

 with the Ungual nerve {3S). 



The ventral portion of the supramylohyoid submaxillary area is 

 occupied by a large pyramidal secondary submaxillary gland (/')• 

 The duct runs cephalad along the ventral border of the main sub- 

 maxillary duct, crosses the medial aspect of the lingual nerve in its 

 company, and then extends under cover of the lesser sublingual mass 

 to a point nearly midway between lingual nerve and plica sublin- 

 gualis, where it joins the main submaxillary duct. 



2. The Greater Sublingual or Bariholinian Gland. —This is not a 

 constant component of the adult human alveolingual complex, but 



