INTESTINAL MUCOUS MEMBRANE. 159 



buted similarly to those of the other papillae of the 

 buccal cavity. 



The glands of the mucous membrane of the tongue Glands. 

 are of two sorts : clusters of follicles, and ductless 

 follicles. The former, strictly speaking, do not belong 

 to the membrane, for they are imbedded in the sur- 

 face of the muscular tissue of the organ. They are 

 very numerous at its base, where they form a con- 

 tinuous layer which extends, on either side, to the 

 pillars of the fauces, and, in front, encroaches upon 

 its papillary surface. Those which are situated pos- 

 teriorly upon the edges of the tongue, and upon the 

 under surface of its tip, are also concealed amongst 

 the superficial muscular fibres of the organ, and are 

 connected with its mucous membrane by their excre- 

 tory ducts only, which pierce it, and open either at 

 the bottom of the sulti on its edges, or on either 

 side of the frcenum. 



The ductless follicles at the base of the tongue Ductless glands, 

 constitute the little lenticular eminences which are 

 found in that region. Upon the summit of each lit- 

 tle projection is an orifice, visible to the naked eye, 

 which leads into a flask-shaped cul-de-sac, the walls of 

 which are continuous, and identical in structure, with 

 the mucous lining of the organ. The network of 

 vessels which immediately surrounds this orifice 

 is closer and richer than elsewhere in its vicinity 

 (PL XXV. fig. V.). The walls of the cavity are 

 reinforced by a dense lamina of connecting tissue, in 

 the substance of which are imbedded about twenty 

 minute spherical bodies, of the same size as the soli- 

 tary glands of the intestine, and identical with them 



