NORMAL HISTOLOGY. 



tery. The organ first lies parallel to the sagittal axis of the body, 

 afterwards changing its position so as to lie transversely, resulting in 

 the approximation and subsequent fusion of the originally distinct 

 rudiments as well as the ducts. The presence of more than one pan- 

 creatic duct in certain animals is explained by the persistence of the 

 embryonal condition. The tubular acini of the organ are developed 

 in a manner similar to that in which those of the other salivary 

 glands are formed : the cylinders of entodermic cells send off 

 branches, which, in turn, give rise to secondary buds, the lumen of 

 the original diverticulum extending into the terminal compartments 

 of the gland. The ingrowth of the surrounding mesoderm establishes 

 the division into lobules and supplies the interlobular connective 

 tissue. 







