DEVELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 297 



19 and 20 millimeters, while it has passed the ganglion, its enlarged 

 extremity is still within the embrace of the mylohyoid muscle, but has 

 begun to turn ventrolaterad towards the interval between the di- 

 gastric and the cartilage of Meckel. At 25 millimeters it has entered 

 the submaxillary mesenchyme and has begun to branch freely. The 

 type is monopodial. In the 35 millimeter embryo it extends caudad 

 almost as far as the subma.xillary, dorsomesal to which it lies; the 

 ducts for some distance are separated by a sheathhke prolongation of 

 the submaxillary ganglion upon the duct of the same name. This 

 general relation is retained in the embryo of 51 millimeters and of 

 70 millimeters. In later stages the greater sublingual suffers relative 

 reduction, for in the adult it cannot be said to extend beyond the 

 digastric upon the dorsal surface of which it is molded, and it has lost 

 its caudal extension mesad of the submaxillary, which it overlaps to only 

 a slight degree. Both glands have altered in shape, as is shown by 

 comparing the elongated pyriform mass of the 35 milKmeter embryo 

 (Fig. 106) with the almost reniform submaxillary of the adult. Their 

 sagittal extent is relatively less, their vertical diameter increased. 



The supramylohyoid portion of the greater sublingual is present 

 in the 51 millimeter embryo as a series of short sprouts incrusting the 

 duct caudad of the lingual crossing (Fig. 109, J4). In the 70 milli- 

 meter embryo these are larger and extend slightly beyond the lingual 

 nerve (Fig. 114, 34). 



The ducts of the subma.xillary and greater sublingual glands pursue 

 a nearly horizontal course beneath the epithelium of the alveolingual 



