152 NORMAL HISTOLOGY. 



alimentary tract, as required by the digestive processes. In the 

 interval it is stored in the gall-bladder. 



The gall-bladder is lined with columnar epithelium, capable of 

 secreting mucus. Beneath this is a layer of fibrous tissue, which 

 becomes areolar and supports the chief bloodvessels and lymphatics. 

 Beneath this is the wall of the organ, composed of interlacing 

 bands of fibrous and smooth muscular tissues. The surface is 

 invested by a portion of the peritoneum. The excretory bile-duct 

 has a similar structure. 



