364 



THE SMALL INTESTINE. 



]•;-. 259. 



number of saccules or alveoli, situate at the terminal ramifications of 

 the duct, which latter penetrates the muscularis mucosae, and opens 



upon the in- 

 ner surface of 

 the intestine. 

 They present 

 transitions 

 lietween com- 

 pound race- 

 mose and 

 compound 

 tubular 

 o'lands.* 

 ^ The soli- 

 tary glands 

 (g 1 a n d u 1 £6 

 golitarias) are 

 soft, Avhite, 

 rounded, and 

 slightly pro- 

 minent bo- 

 dies about the 

 size of a 

 millet-seed, 

 which are 

 found scat- 

 tered over the 

 raucous mem- 

 brane in 

 every part of 

 the small in- 

 testine (fig. 

 260). They 

 are found as 

 well at the 

 mesenteric as 

 at the free 



border, both between and upon the valvuljB conniventes, and are 

 rather more numerous in the lower portion of the bowel. These so-called 



Fig. 25y. — Deep part of a Ckypt of Lieiierkuhn from the Rab- 

 bit's Intestine, seen in Vertical Section. Highly magnified 

 (Verson). 



a, columnar epithelium ; d, lymphoid tissue of the mucous membrane 

 seen to be connected with the basement membrane, and to extend 

 between the epithelium cells. T, areolar tissue ; h, lumen of gland. 



Pis', 200. 





Fig. 2G0. — Solitary Gland of the Small Intestine (from 

 Bcehm). 10 Diameters. 



The lighter part of the figure represents the elevation pro- 

 duced by the gland ; on this a few villi are seen, and on the 

 surrounding surface of the mucous membrane numerous villi 

 and crypts of Lieberkiihn. 





glands are in structure similar to the lymphoid 

 follicles of various parts ah'eady described, con- 

 sisting of more or less insulated clumps of dense 

 retiforui tissue, the meshes of which are closely packed with lymph- 

 corpuscles and pervaded by fine capillaries. They are here and there 

 united at the sides with the surrounding lymphoid tissue, but are at 



* Schwalbe, Archiv. f. mikr. Anat. viii. 1872. 



