28 



Small Intestine. 



357 a. Segment of the In- 357b. Segment of the In- 

 ner Surface of the Small ner Surface of the Small 



Intestine, natural size. Intestine, somewhat magnified. 



In tlie small intestine there are four kinds of glands : 



a) The crypts of Lieberkiihn are minute tubular depressions, 

 scattered between the villi. 



b) B runner's glands are acinous glands found only in the 

 duodenum, especially numerous at its commencement. 



c ) The solitary follicles are scattered throughout the mucous 

 membrane of the small intestine; they are of different size and similar 

 in structure to the lymphatic glands. 



dj The agminated glands or glands of Payer are aggre- 

 gations of solitary glands, usually found only in the ilcum ; they are placed 

 lengthwise in the intestine, at that part of the tube most distant from 

 the mesentery. 



The large intestine commences at the coecum, to the lower 

 part of which the v e r m i f o r m a p p e n d i x , Processus vermicular is 7 from 

 "2 3 inches in length, is attached; the portion succeeding the coecum 

 is the colon, divided into an ascending, Colon ascendens, transverse, 

 Colon traiisversum, descending, Colon dcsccndcns, and sigmoid flexure, Flexura 

 slgmoidea s. 8 romanum; the last portion is the rectum, Intestinum rectum, 

 which ends at the anus. Only the coecum with the vermiform appen- 

 dix, transverse colon and sigmoid flexure are completely invested by 

 peritoneum, which is more or less wanting on the posterior surface of 

 the other parts of the large intestine. 



