LESSON XIX. 

 STRUCTURE OF LIVER. GLYCOGEN. 



A. STRUCTURE OF LIVER. 



1. Prepare sections of the liver of a frog, snake or 

 bird, treated with 1 p. c. osmic acid and subse- 

 quently with alcohol. Mount a section in dilute 

 glycerine. Observe with a low power that the 

 gland apart from the ducts and ductules consists 

 of anastomosing tubes between which the 

 blood capillaries run. 



Observe with a high power 



a. The tubes. In transverse section they are 

 seen to consist of four to six liver cells, each 

 cell containing a large nucleus usually in its 

 outer portion. 



b. The bile capillaries ; these are the lumina 

 of the tubes ; in longitudinal sections of the 

 tubes the bile capillaries are seen to take a 

 zigzag course between the inner ends of the 

 cells. 



