THE ALIMENTARY CANAL 



345 



forms a continuous tube whose wall has, throughout its entire extent, 

 many common characteristics. Thus the wall in all portions consigts_of 



Tongue 



Cecu 

 Vermiform appendix-^ 



Parotid gland 



Sublingual gland 

 Submaxillary gland 



Parathyroids 

 Thymus 



Esophagus 



Diaphragm 



Duodenum 



Appendices epiploicce 



Jejunum 



Longt. muscle band 



Ileum 

 Haustra 



\J 



Anus 



FIG. 324. DIAGRAM OF THE ALIMENTARY CANAL OF MAN. 



7s, small intestine; Ca, Ct, and Cd, ascending, transverse and descending portions 

 of the colon; Ph, pharynx; Vic, ileocolic valve. (Adapted from Wiedersheim.) 



four coats which are respectively known, from within outward, as the 

 mucous, submucous, muscular, and fibroserous. The three outermost 

 coats are of very similar structure in all portions of the tract. 



The Fibroserous Coat. In the abdominal cavity the outermost 



