14° THE FROG chap, viii 



with goblet cells amongst them ; and a deeper connective-tissue laver, 

 the submticosa, enclosing blood-vessels, nerves, and lymphatics. 



b. Muscular layer : an external longitudinal, and an internal circular 

 layer of unstriped muscular fibres. 



t. Peritoneal layer. This is very thin, and a careful examination 

 of good preparations is required in order to make out its structure 



(P- 130- 

 Sketch. 



3- Transverse section of stomach (Fig. 40).— After recognising 



the layers as above, note : — 



a. The gastric glands, and b. The muscularis mucoste. 

 Sketch. 



4- Sections of liver (Fig. 41). 



a. Polyhedral gland-cells ; b.. Bile passages and ducts ; c. Blood capil- 

 laries and vessels. 

 Sketch. 



5- Sections of pancreas (Fig. 42). 



a. Lobules, each consisting oi gland-cells ; b. Duels. 

 Sketch. 



