46 THE STRUCTURE OF THE FOWL 



membrane. The secretory epithelium of these 

 glands is clear and columnar. The deepest 



part of the mucous mem- 

 brane contains a consider- 

 able amount of muscular 

 tissue constituting the 

 muscularis mucosae. 



The crop (Fig. 14) pos- 

 sesses the same structure 

 as the rest of the oeso- 

 phagus, except that glands 

 are absent. 



The stomach (Fig. 15) of 

 the fowl consists of two por- 

 tions, differing widely both 

 in structure and function. 

 1. The glandular stomach 

 is relatively small and tubu- 

 lar, and on superficial ex- 

 amination appears to be 

 little more than a wider 

 continuation of the oeso- 



oe., oesophagus; gl.st., glandular , ^^ • i ■ • 



stomach; g., gizzard; d.i, first phagUS. (JU maUipulatlOU, 



part of duodenum ; d.2, second , • ■ • t • i 



part of duodenum; pan., pancreas; hOWCVCr, it IS QlSCOVercd 



'''^^^^''' that the wall of the tube 



is of considerable thickness. The position 

 of this stomach is median and between the 



Fig. 15. — Crop, Stomach, 

 and Duodenum. 



