314 THE PHARYNX. 



vented by the strong ligamentous barrier placed between. 

 It is very important, in the excision of tumors, or other op- 

 erations on one side of the tongue, to know there is no danger 

 of hemorrhage from the vessels of the opposite side. 



Nerves, (Fig. 91.) The nerves of the tongue come from 

 three sources, and are large. 1. The Gustatory branch of 

 the fifth pair goes to the papilla, and gives common sensi- 

 bility, and is also supposed to be the special sense of taste. 

 FIG. 91. 2. The Lingual, or ninth 



pair, goes to the muscles 

 and gives the power of mo- 

 tion. 3. The Gloss o-pliaryn- 

 geal supplies the follicles, 

 glands, and mucous mem- 

 brane of the tongue, and 

 is regarded as a compound 

 nerve, having both sensa- 

 tion and motion. This 

 nerve connects the tongue 

 with the pharynx and la- 

 rynx. A branch of the fa- 

 cial nerve has also been found in the tongue, but was seen 

 only on one side. 



THE PHAKYNX. 



The Pharynx (Fig. 92) is situated at the posterior part 

 of the mouth, behind the nares, in front of the cervical 

 vertebrae, and below the base of the skull, extending infe- 



FIG. 91 represents the side of the Tongue, with the relations of its vessels and 

 nerves, a Hyoglossus muscle. 6 c Section of the lower jaw at its symphysis. 

 d Genio-hyo-glossus. e Genio-hyoideus. /Left edge of mylo-hyoideus. g Com- 

 mon carotid artery, and its division into external and internal, h Trunk of 

 superior thyroid, i Lingual artery, j Constrictor medius muscle, k Hori- 

 zontal portion of lingual artery. / Its oblique or terminating portion, m The 

 ranine artery, n Trunk of the facial artery, o The three posterior branches 

 of external carotid, p Trunk of ascending pharyngeal. r Terminus of ex- 

 ternal carotid into internal maxillary, and temporal arteries, s Gustatory 

 branch of the fifth nerve, *its communication with the lingual, t Glosso-pha- 

 ryngeal nerve. M Hypoglossal or ninth nerve, v Duct of Wharton, or sub- 

 maxillary duct, to Sublingual gland. 



