IMMUNITY IN HEALTH 



Fig. 23. 



Diagram of the cagcum and appendix in a rabbit. The patches of 

 lymphoid tissue at the ileo-caecal junction are also shown. The small 

 figure in the centre shows the lymphoid tissue from the peritoneal 

 aspect as it occasionally appears to the naked eye. In the specimen 

 fiom which this diagram was taken only the caecal part of the ileo- 

 caecal lymphoid tissue showed this appearance. 



The mucous membrane of the vermiform appendix 

 of the rabbit is lined by columnar epithelium. Many 

 goblet cells are to be seen. At regular intervals the 

 cokimnar epithelium dips down to form a narrow stem 

 and then spreads out dome-wise to form the deeper 

 calyx-like portion of the gland, up into which projects 



