CH. LIX.j SALIVARY GLANDS, PANCKEAS, AND LIVER 



869 



the pancreas are developed exactly in the same way, and their 

 cells are derived from the hypoblast lining the fore-gut, while those 



Fio. 667. Lobules of the parotid with the salivary ducts, in the embryo of the sheep, 

 at a somewhat advanced stage. 



of the parotid glands are formed from the epiblast lining the 

 stomadsBum. In both cases the blood-vessels and connective tissues 



Fio. 6(58. Diagram of part of digestive tract of a chick (4th day). The black line represents hypoblast, 

 the outer shading mesoblast. Ig, Lung diverticulum with expanded end forming primary lung- 

 vesicle ; St, stomach ; I, two hepatic diverticula, with their terminations united by solid rows of hypo- 

 blast cells ; p, diverticulum of the pancreas with the vesicular diverticula coming from it. (Gotte.) 



are formed from the mesoblast into which the glandular structure 

 grows. 



The Liver. The liver is developed by the protrusion of a part of 



