288 



The Ducts of the Human Subuiaxillarv Gland 













%-V\ 





As the duct enters the hdus of the lobule (Fig. 8) a considerable 

 portion of the sublobular connective tissue is carried in with it, a rela- 

 tion between the lobular duct and lobule similar to that observed 

 between the Ductus submaxillaris and the gland as a whole. The con- 

 nective tissue which enters the lobule at this point, is continuous with 

 that of the sublobular space from which it springs and possesses osten- 

 sibly the same character- 

 istics and relations. It 

 may be observed that the 

 spaces containing the sub- 

 lobular ducts are the points 

 of origin of several lobules 

 which may be seen in sec- 

 tions and piece digestions 

 as arising from these cen- 

 ters (Figs. 4 and 8). That 

 is to say, the hilus of the 

 lobule is attached at these 

 points and this intimate 

 association with the sub- 

 lobular interspaces is the 

 only firm point of union be- 

 tween the lobules and the 

 glandular frame-work, inas- 

 much as the fibrils connect- 

 ing adjacent limiting mem- 

 branes are, as a rule, too 

 scant and delicate to have 

 an extensive supporting 

 function (Figs. 5 and 8). 

 This is a point of consider- 

 able importance when the 

 origin of the lobule in the 

 development of the gland is 

 considered. As soon as the 

 duct is within the lobule the same relations observed in corrosions and 

 digestions are seen in ordinary sections, namely that the ducts which are 

 cut in various directions, transversely, longitudinally and obliquely, 

 are observed to lie in the central portions of the lobule away from the 

 membrana limitans. Indeed, it is only very rarely that sections of the 

 ducts are seen nearer the perilobular membranes (Fig. 8) than the 



pQiy 



■ O 



K\ 



:A-i 



f><[ 



•vKiC^^ti^^-.- 



f: 3-L. fee 



Frr;. S.—Lohulc of the humaii suhm axillary gland, 

 showiwj the hUiis and the lobular ducts. Magnified 

 about 85 diameters. Same stain as Fiy. 5. The at- 

 tachment of the lobule to the sublobular interspace 

 is clearly shown and the arrangement of the connec- 

 tive tissue as it enters the lobuU' with the lobular 

 duct, is evident, 'i'he membrana limitans has very 

 few connections with those of the adjacent lobules. 

 the main attachmeut of the lobule being- the jKirtion 

 at the hilus. The distribution of the intralobular 

 ducts in the central portion of the lobu es away fiora 

 the membrana limitans is well represented. JL, Sub- 

 lobular duct ; B, Sublobular interspace ; M. Mem- 

 brana limitans; ly, Lobular duct at hilus of lobule; 

 /, Intralobular duct. 



