206 ELEMENTS OF HISTOLOGY. [Chap. xxv. 



adenoid tissue of the follicles (Watney), similar to 

 what is the case in the tonsils (see par. 124). 



The outer muscular coat consists of an inner thicker 

 circular and an outer thinner longitudinal stratum of 

 non-striped muscular tissue. 



In the large intestine, in the "ligamenta," only 

 the longitudinal layer is present, and is much thickened 



273. The blood-vessels form separate systems of 

 capillaries for the serous covering, for the outer mus- 

 cular coat, for the muscularis mucosse, and the richest 

 of all for the mucosa with its Lieberkiihn's crypts. 

 The capillary network of the villi is connected with 

 that of the rest of the mucosse. 



The chyle vessel, or vessels of the villi, commence 

 with a blind extremity near the apex of the villi. 

 At the base the chyle vessel becomes narrower, and 

 empties itself into a plexus of lymphatic vessels and 

 sinuses belonging to the mucosa, and situated between 

 the crypts of Lieberkiihn (Fig. 120). This network is 

 the same both in the small and large intestine, as 

 is also that of the lymphatics of the submucosa with 

 which the former communicates. The lymph follicles 

 are generally surrounded with sinuous vessels of this 

 plexus. The efferent trunks of the submucous plexus, 

 while passing through the outer muscular coat in order 

 to reach the mesentery, take up the efferent vessels of 

 the plexus of the lymphatics of the muscular coat. 



The chyle, composed of granules and globules 

 of different but minute sizes, passes from the inner 

 free surface of the mucous membrane of the small 

 intestine through the epithelium (probably through its 

 fluid interstitial cement substance) into the reticulum 

 of the villus matrix, and from thence the central 

 chyle vessel, and farther into the plexus of vessels 

 of the mucosa and submucosa. 



Owing to the peripheral disposition of the 

 capillaries in the villi, and owing to the greater 



