Joseph Marshall Flint 



275 



the vessels and ducts enter the gland at the liilus. At this stage in its 

 development the organ is encapsulated. 



Before the duct of the human gland penetrates the hilus of the 

 organ, it is often joined by a small duct, either from the aberrant lobes 

 which so frequently occur or from the anterior prolongation of the 



Fig. 1. — CeUoidin corrosion of the ducts of the human snhmaxillary gland. Mao;nifled 4 

 diameters. Tbe Ductus submaxillaris is sliown as tlie main trunk in tliis tree, giving 

 ofi' the primary branclies just witliin tlie boundaries of tlie gland wliicli are here 

 roughly marked out by the terminal twigs. The secondary divisions are the inter- 

 lobular ducts. These radiate from the central to the peripheral portion of the gland. 

 The secondary branches of the interlobular ducts form the sublobular system. These 

 divide once or twice and at this point the injection mass has usually stopped, 

 although in a few places it has penetrated into the lobular ducts. The interlobular 

 ducts may divide into one or two larger branches before exhausting themselves in 

 the sublobular system. A, Ductus submaxillaris; iJ, primary ducts; C, interlobular 

 ducts; i>, sublobiilar ducts. 



gland which extends with the duct between the M. hyoglossus and mylo- 

 hyoid. The corrosions by means of which the ducts are studied look 

 remarkably like miniature representations of certain species of trees, 



