24 SPECIAL HISTOLOGY. 



the root of the tongue, also, possesses gustatory sensibility. 

 Upon these grounds, I think it is impossible, for the present, 

 wholly to deny a relation of the ganglia in question, to the 

 sensations.] 



C. OP THE GLANDS OP THE OBAL CAVITY. 

 1.— MUCOUS GLANDS. 



§ 133. 



The mucous glands of the oral cavity are yellowish or whitish 

 racemose glands, usually of a rounded form and tuberculated 

 surface of \ — 2'" in diameter, which in general lie immediately 

 external to the mucous membrane and yield a mucous secretion. 



According to the localities in which they are found, the 

 mucous glands present somewhat different relations and receive 

 different names. 



1. The labial glands, ± — 1J'" in diameter, lie between the 

 muscular layer and the mucous membrane, are very numerous, 

 and form an almost continuous glandular ring round the oral 

 aperture, which commences at 3'" distance from the red edge 

 of the lips, and possesses a breadth of about £". 



2. The buccal glands; lying further outwards, covered by the 

 buccinator muscle, are tolerably numerous but smaller; a few 

 large glands appear at the aperture of S tenon's duct upon the 

 buccinator muscle and still further backwards in the neighbour- 

 hood of the last molar tooth [molar glands). 



3. The palatine glands. — Those of the hard palate are small 

 and hardly pass beyond its middle anteriorly, while on the 

 other hand, those of the soft palate form a considerable layer of 

 glands upon its under side, which anteriorly measures as much 

 as 3 — 4'", diminishing, however, somewhat towards the free 

 edge and the uvula. On the posterior surface of the soft 

 palate, also, glands exist, but they are much smaller, and do 

 not always form a connected layer. 



4. The lingual glands, among which I distinguish : 



a. The mucous glands of the root of the tongue. — These form 

 a stratum, in parts very thick, of glands J — 2"' in diameter, 

 beneath the simple mucous sacs of the root of the tongue, to 



