1658 



HUMAN ANATOMY. 



rupted layer of parallel tubules. The largest ones are in the rectum, where they 

 measure. 7 mm. (Verson). The lining of the glands is conspicuous on account of 

 the great number of goblet-cells, which in the middle and upper parts of the tubules 



Fig. 1406. 





» VAC'S! e-j/*,5 ^ -«■ 



Surface views of mucous membrane of ascending colon. A, natural size ; B, magnified 30 diameters, showing orifices 



of Lieberkiihn's glands. 



often exist in such profusion that the ordinary cells are almost entirely replaced ; 

 towards the deepest part, or fundus, of the glands they are comparatively infrequent. 

 The presence of goblet-cells in such numbers accounts for the considerable amount 

 of mucus normally poured into the large intestine. 



Fig. 1407. 



Lieberkiihn's glands 



Solitary lymph-nodule !^ti'^^iM^'J:0'. 



Mucous coat- 









Submucous 

 coat 



Circular 

 muscle 



Longitudinal 

 muscle 



Serous coat 



'^ :^^-^^^ ^mM 



Longitudinal section of ascending colon, showing general arrangement of coats and solitary lymph-nodule. X 30. 



The lymphatic tissite in definite collections occurs as solitary nodules only, 

 Peyer's patches being absent within the large intestine. The lymph-nodules, which 

 occupy a portion of the submucous coat as well as the mucosa, are largest and most 



