CHAP. XIX.] ORGANS OF SPECIAL SENSE. 



225 



the skin ; the remainder are compound, 1 and are only found on 

 the surface of the tongue. Of these compound papillae there 

 are three varieties. The largest, the circumvallate papillce, are 

 about eight or ten in number, and form a V-shaped row near the 

 root of the tongue, with its open angle turned toward the lips. 



FIG. 132. THE UPPER SURFACE OF THE TONGUE. 1, 2, circumvallate papillae; 

 3, f ungiform papillae ; 4, filiform papillae ; 6, mucous glands. 



The next in size are the f ungiform papillae? found principally on 

 the tip and sides of the tongue. The smallest and most numer- 

 ous are the filiform papillce, found all over the tongue, excepting 



1 A compound papilla is one large one bearing several smaller ones on its surface. 



2 The fungiform papillae resemble fungi, having an expanded upper portion 

 resting on a short, thick pedicle. The circumvallate papillae resemble the fungi- 

 form, except that they are surrounded by a wall of smaller papillae. 

 Q 



