2 6 THE DEVELOPMENT OF THE SALIVARY GLANDS IN MAN 



edge is as complete as it is, in major matters, is owing to the ac- 

 curate work of the several writers, above all to the fine objectivity 

 of the admirable Chievitz. 



At the outset the hopelessly confused and confusing nomenclature 

 of the glandiferous sulci is hampering. The sulcus between the 

 mandibular and maxillary processes, which gives origin to the parotid 

 gland and the orbital inclusion, received a name first from Molden- 

 hauer, sulcus lingualis. This term Hammar ('02) replaced with the 

 more suitable sulcus buccalis. The wide gutter intervening between 

 the tongue and the inferior alveolar process, which receives the pro- 

 jection of the palate process, Chievitz terms sulcus alveololingualis. 

 The bottom of this gutter presents at certain stages of its development 

 three small furrows (Fig. i) : one (8) bounding it against the tongue 

 and giving origin to the submaxillary gland has no specific name in 

 the literature ; a second (14) defining the gutter from the alveolar 

 process, in association with which develop some of the early sprouts 

 of the lesser sublingual glands, is termed the sulcus sublingualis by 

 His, who conjectured that it gave origin to the sublingual gland. 

 Between the two a much shallower furrow (16) is found in embryos 

 of about 15-22 miUimetersin length. It maybe seen in the figures of 

 His ('85, Fig. 65, right side) and Chievitz ('85, Fig. 7) as a very slight 

 concavity indenting the ridge that separates the other two furrows. 

 In our 20 millimeter embryo it is more distinct and the epithelium 

 along its fundus is thickened to form a slight keel (Fig. 14, 16). In 

 man it has not been found to give rise to sprouts. As it is necessary 

 to consider these sulci in some detail, the following terminology is sug- 

 gested : for the wide gutter between the tongue and the alveolar process, 

 regio alveolingualis , alveolingual region or gutter ; for its median 

 Hmiting furrow, sulcus lingualis, lingual sulcus ; for the lateral fur- 

 row, sulcus alveolaris, alveolar sulcus ; the fainter furrow between 

 may conveniently be called the intermediate sulcus, sulcus intertnedius. 

 For the lateral border of the oral cavity, the appropriate designation 

 of Hammar is retained, sulcus buccalis. 



In reference to the situation of gland sprouts it is often necessary 

 to define accurately their position. When they are attached to the 

 exact fundus of the sulcus, occupying the middle of its crown and 

 projecting as the keystone of an arch often projects beyond the other 



